Sum Problem

 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

    public class Main {

    public static void main(String[] args) {
        Scanner n1 = new Scanner(System.in);
        int result = 0;
        // Scanner n2= new Scanner(System.in);
        while (n1.hasNextInt()) {
            int n = n1.nextInt();
            for (int i = 1; i <= n; i++) {
                result = result + i;
            }
            System.out.println(result);
            System.out.println();//换行
            result = 0;
        }
    }
}