Java program to print sum of n natural numbers

Following program shows you how to print sum of n natural numbers.
In this program we get number from user and shows sum of n natural numbers using following formula
Sum of n natural numbers = input X (input + 1)/2

import java.util.Scanner;

public class BasicMath17 {

	public static void main(String[] args) {

		int input;
		System.out.println("Enter a number:");

		Scanner in = new Scanner(System.in);
		input = in.nextInt();

		int result = input * (input + 1) / 2;

		System.out.println(result);

	}
}

Output:

Enter a number:
4
10