BEGIN-2

hdvsyu · Jan 18, 2016 · 3071c4b · 3071c4b
1 parent 59a7696
commit 3071c4b
Showing 1 changed file with 17 additions and 0 deletions.
diff --git a/BEGIN/begin2/Main.java b/BEGIN/begin2/Main.java
@@ -0,0 +1,17 @@
+package begin2;
+
+import java.util.Scanner;
+
+public class Main {
+
+	public static void main(String[] args) {
+
+		Scanner in = new Scanner(System.in);
+		long n = in.nextLong();
+		in.close();
+
+		// Gauss sum.
+		System.out.println((1 + n) * n / 2);
+	}
+
+}