Challenge: Sum 1 to N

Lab Java Beginner 10 points

Read a whole number n and print the sum 1 + 2 + ... + n.

Input

One whole number n (1 ≤ n ≤ 10000).

Output

The sum.

Example

Input

Output

Sample input available Sample output available

Editor

Java

Hints

Start with sum = 0.

Loop i from 1 to n and add i each time.

Solution explanation

A for loop visits every number from 1 to n; sum += i keeps a running total.

Show solution

import java.util.Scanner;

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

Output

Answer