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+```c#
+using System;
+
+public class testt
+{
+    public static void Main(string[] args)
+    {
+        long num = long.Parse(Console.ReadLine());
+        long sum = 0;
+        for (int i = 1; i <= num; i++)
+        {
+            sum += i;
+        }
+        Console.WriteLine(sum);
+	}
+}
+```
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