백준 8393 합

문제

해결방안

import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		Scanner scanner = new Scanner(System.in);
		
		int x = scanner.nextInt();
		
		int sum = 0;
		
		for (int i = 1; i <= x; i++) {
			sum +=i;
		}
		System.out.println(sum);
		
	}
}