[백준 baekjoon] 8393번 풀이 (JAVA)

import java.util.Scanner;

public class _8393 {

	public static void main(String[] args) {

		Scanner sc = new Scanner(System.in);
		
		int n = sc.nextInt();
		int s = 0;
		
		for (int i = 1; i <= n; i ++)
		{
			s += i;	
		}

		System.out.println(s);
		sc.close();

	}

}