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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



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