【杭电1001】Sum Problem

Sum Problem

Time Limit: 1000/500 MS (Java/Others) Memory Limit: 65536/32768 K (Java/Others)
Total Submission(s): 448087 Accepted Submission(s): 112622

Problem Description

Hey, welcome to HDOJ(Hangzhou Dianzi University Online Judge).

In this problem, your task is to calculate SUM(n) = 1 + 2 + 3 + ... + n.

Input

The input will consist of a series of integers n, one integer per line.

Output

For each case, output SUM(n) in one line, followed by a blank line. You may assume the result will be in the range of 32-bit signed integer.

Sample Input

1
100

Sample Output

1

5050
code:
import java.util.*;
public class Main{
	public static void main(String[] args){
		Scanner in=new Scanner(System.in);
		while(in.hasNextInt()){
			int n=in.nextInt();
			int sum=0;
			for(int i=1;i<=n;i++)
			sum+=i;
			System.out.println(sum+"\n\n");
		}
	}
}