杭电ACM 1001题

 

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