[JAVA] 백준 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 sum = 0;
            for(int i=1; i<=n; i++) {
                sum += i;
            }
            System.out.println(sum);
        }
    }

:)