[백준 / 입출력] 8393 : 합 (Java)

<정답>

import java.util.*;

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