537 : 반복제어문1 - 자가진단2

Java

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