diff --git a/src/main/java/gpacalc/Application.java b/src/main/java/gpacalc/Application.java
index 57e79e1..bb07c99 100644
--- a/src/main/java/gpacalc/Application.java
+++ b/src/main/java/gpacalc/Application.java
@@ -1,7 +1,193 @@
 package gpacalc;
 
+import java.util.ArrayList;
+import java.util.Arrays;
+import camp.nextstep.edu.missionutils.Console;
+import static camp.nextstep.edu.missionutils.Console.readLine;
+
 public class Application {
     public static void main(String[] args) {
-        //TODO: 구현
+        //TODO:
+        String[] mainSubjects;
+        String[] subSubjects;
+
+        System.out.println("전공 과목명과 이수학점, 평점을 입력해주세요(예시: 프로그래밍언어론-3-A+,소프트웨어공학-3-B+):");
+        String input = readLine();
+
+        mainSubjects = input.split(",");
+
+        System.out.println("교양 과목명과 이수학점, 평점을 입력해주세요(예시: 선형대수학-3-C0,인간관계와자기성장-3-P):");
+        input = readLine();
+
+        subSubjects = input.split(",");
+
+        ArrayList<Subject> mainContent = new ArrayList<>();
+        ArrayList<Subject> subContent = new ArrayList<>();
+
+        Subject main = null;
+        Subject sub = null;
+        String[] temp;
+
+        for(String subject: mainSubjects){
+            temp = subject.split("-");
+            main = new Subject(temp[0], temp[1], temp[2]);
+            mainContent.add(main);
+        }
+
+        for(String subject: subSubjects){
+            temp = subject.split("-");
+            sub = new Subject(temp[0], temp[1], temp[2]);
+            subContent.add(sub);
+        }
+
+        for(Subject subject: mainContent){ // 전공과목의 argument validation
+            try{
+                if((!(subject.getGrade().equalsIgnoreCase("A+") || subject.getGrade().equalsIgnoreCase("A0")
+                        || subject.getGrade().equalsIgnoreCase("B+") || subject.getGrade().equalsIgnoreCase("B0")
+                        || subject.getGrade().equalsIgnoreCase("C+") || subject.getGrade().equalsIgnoreCase("C0")
+                        || subject.getGrade().equalsIgnoreCase("D+") || subject.getGrade().equalsIgnoreCase("D0")
+                        || subject.getGrade().equalsIgnoreCase("F")  || subject.getGrade().equalsIgnoreCase("P")
+                        || subject.getGrade().equalsIgnoreCase("NP"))
+                ) || (!(subject.getCredit().equalsIgnoreCase("1") || subject.getCredit().equalsIgnoreCase("2")
+                        || subject.getCredit().equalsIgnoreCase("3") || subject.getCredit().equalsIgnoreCase("4"))
+                ) || (subject.getName().length() > 10)){
+                    IllegalArgumentException IllegalArgumentException = new IllegalArgumentException();
+                    throw IllegalArgumentException;
+                }
+            }catch (IllegalArgumentException IllegalArgumentException){
+                throw new IllegalArgumentException();
+//                System.exit(0);
+            }
+        }
+
+        for(Subject subject: subContent){ // 교양과목의 argument validation
+            try{
+                if((!(subject.getGrade().equalsIgnoreCase("A+") || subject.getGrade().equalsIgnoreCase("A0")
+                        || subject.getGrade().equalsIgnoreCase("B+") || subject.getGrade().equalsIgnoreCase("B0")
+                        || subject.getGrade().equalsIgnoreCase("C+") || subject.getGrade().equalsIgnoreCase("C0")
+                        || subject.getGrade().equalsIgnoreCase("D+") || subject.getGrade().equalsIgnoreCase("D0")
+                        || subject.getGrade().equalsIgnoreCase("F")  || subject.getGrade().equalsIgnoreCase("P")
+                        || subject.getGrade().equalsIgnoreCase("NP"))
+                ) || (!(subject.getCredit().equalsIgnoreCase("1") || subject.getCredit().equalsIgnoreCase("2")
+                        || subject.getCredit().equalsIgnoreCase("3") || subject.getCredit().equalsIgnoreCase("4"))
+                ) || (subject.getName().length() > 10)){
+                    Exception IllegalArgumentException = new Exception();
+                    throw IllegalArgumentException;
+                }
+            }catch (Exception IllegalArgumentException){
+                System.exit(0);
+            }
+        }
+
+        int totalCredit = 0;
+        int mainCredits = 0;
+        int subCredits = 0;
+        double totalGrade = 0;
+        double averageGradeForAll = 0;
+
+        for(Subject subject: mainContent){
+            if(!(subject.getGrade().equalsIgnoreCase("NP") || subject.getGrade().equalsIgnoreCase("F"))){
+                totalCredit += Integer.parseInt(subject.getCredit());
+            }
+        }
+
+        for(Subject subject: subContent){
+            if(!(subject.getGrade().equalsIgnoreCase("NP") || subject.getGrade().equalsIgnoreCase("F"))){
+                totalCredit += Integer.parseInt(subject.getCredit());
+            }
+        }
+
+        for(Subject subject: mainContent){ //전공과목 성적가중치 계산
+            if(!(subject.getGrade().equalsIgnoreCase("P") || subject.getGrade().equalsIgnoreCase("NP"))){
+                mainCredits += Integer.parseInt(subject.getCredit());
+                switch (subject.getGrade()){
+                    case "A+":
+                        totalGrade += 4.5*(Integer.parseInt(subject.getCredit()));
+                        break;
+                    case "A0":
+                        totalGrade += 4.0*(Integer.parseInt(subject.getCredit()));
+                        break;
+                    case "B+":
+                        totalGrade += 3.5*(Integer.parseInt(subject.getCredit()));
+                        break;
+                    case "B0":
+                        totalGrade += 3.0*(Integer.parseInt(subject.getCredit()));
+                        break;
+                    case "C+":
+                        totalGrade += 2.5*(Integer.parseInt(subject.getCredit()));
+                        break;
+                    case "C0":
+                        totalGrade += 2.0*(Integer.parseInt(subject.getCredit()));
+                        break;
+                    case "D+":
+                        totalGrade += 1.5*(Integer.parseInt(subject.getCredit()));
+                        break;
+                    case "D0":
+                        totalGrade += 1.0*(Integer.parseInt(subject.getCredit()));
+                        break;
+                    default:
+                        totalGrade += 0;
+                        break;
+                }
+            }
+        }
+
+        double averageGradeForMain = totalGrade/mainCredits; //전공과목 평점평균 계산
+
+        for(Subject subject: subContent){ //교양과목 성적가중치 계산
+            if(!(subject.getGrade().equalsIgnoreCase("P") || subject.getGrade().equalsIgnoreCase("NP"))){
+                subCredits += Integer.parseInt(subject.getCredit());
+                switch (subject.getGrade()){
+                    case "A+":
+                        totalGrade += 4.5*(Integer.parseInt(subject.getCredit()));
+                        break;
+                    case "A0":
+                        totalGrade += 4.0*(Integer.parseInt(subject.getCredit()));
+                        break;
+                    case "B+":
+                        totalGrade += 3.5*(Integer.parseInt(subject.getCredit()));
+                        break;
+                    case "B0":
+                        totalGrade += 3.0*(Integer.parseInt(subject.getCredit()));
+                        break;
+                    case "C+":
+                        totalGrade += 2.5*(Integer.parseInt(subject.getCredit()));
+                        break;
+                    case "C0":
+                        totalGrade += 2.0*(Integer.parseInt(subject.getCredit()));
+                        break;
+                    case "D+":
+                        totalGrade += 1.5*(Integer.parseInt(subject.getCredit()));
+                        break;
+                    case "D0":
+                        totalGrade += 1.0*(Integer.parseInt(subject.getCredit()));
+                        break;
+                    default:
+                        totalGrade += 0;
+                        break;
+                }
+            }
+        }
+
+        averageGradeForAll = totalGrade/(mainCredits+subCredits); //전체과목 평균평점 계산
+
+        System.out.println("\n<과목 목록>");
+        for(Subject subject: mainContent){
+            System.out.println("[전공] " + subject.getName() + "," + subject.getCredit() + "," + subject.getGrade());
+        }
+        for(Subject subject: subContent){
+            System.out.println("[교양] " + subject.getName() + "," + subject.getCredit() + "," + subject.getGrade());
+        }
+
+        System.out.println("\n<취득학점>");
+        System.out.println(totalCredit + "학점");
+
+        System.out.println("\n<평점평균>");
+        System.out.println((double)Math.round(averageGradeForAll*100)/100 + " / 4.5");
+
+        System.out.println("\n<전공 평점평균>");
+        System.out.println((double)Math.round(averageGradeForMain*100)/100 + " / 4.5");
+
     }
+
 }
diff --git a/src/main/java/gpacalc/Subject.java b/src/main/java/gpacalc/Subject.java
new file mode 100644
index 0000000..0dcf83b
--- /dev/null
+++ b/src/main/java/gpacalc/Subject.java
@@ -0,0 +1,37 @@
+package gpacalc;
+
+public class Subject {
+    private String name;
+    private String credit;
+    private String grade;
+
+    public Subject(String name, String credit, String grade){
+        this.name = name;
+        this.credit = credit;
+        this.grade = grade;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public String getCredit() {
+        return credit;
+    }
+
+    public void setCredit(String credit) {
+        this.credit = credit;
+    }
+
+    public String getGrade() {
+        return grade;
+    }
+
+    public void setGrade(String grade) {
+        this.grade = grade;
+    }
+}
diff --git a/src/test/java/ApplicationTest.java b/src/test/java/ApplicationTest.java
index 38086f8..ad37e6e 100644
--- a/src/test/java/ApplicationTest.java
+++ b/src/test/java/ApplicationTest.java
@@ -52,3 +52,4 @@ protected void runMain() {
         Application.main(new String[]{});
     }
 }
+