HDOJ 1001 Sum Problem

題目：http://acm.hdu.edu.cn/showproblem.php?pid=1001

import java.io.*;
import java.util.*; 

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