[자바] 정올 537 : 반복제어문 - 자가진단2

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