[백준] 합 / for문

8393번

 

내 제출

import java.util.Scanner;
class Main{
    public static void main(String[] args) {
        Scanner scn = new Scanner(System.in);
        int num = scn.nextInt();
        int sum = 0;
        if(num == 1) {
            System.out.println(1);
        } else {
            for(int i = 0; i <= num; i++) {
                sum += i;
            }
            System.out.println(sum);
        }
    }
}