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import java.util.*;

public class Program56 {

//print sum of first n natural numbers using recursion

public static void main(String[] args) {

Scanner sc = new Scanner(System.in);

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

int n = sc.nextInt();

int sum = sumOfNaturalNumbers(n);

System.out.println("Sum of first " + n + " natural numbers is: " + sum);

}

public static int sumOfNaturalNumbers(int n) {

if (n == 0) {

return 0;

}

return n + sumOfNaturalNumbers(n - 1);

}

}