백준 - 8393

https://www.acmicpc.net/problem/8393

8393번: 합

import java.util.Scanner;
public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int n = sc.nextInt();
        int answer = 0;
        for(int i = 1; i <= n; i ++){
            answer += i;
        }
        sc.close();
        System.out.println(answer);
    }
}