import java.util.Scanner; class SumOfFirstN { public static void main(String[] args) { Scanner s = new Scanner(System.in); System.out.print("Enter the value of n :: "); int n = s.nextInt(); int sum = 0; for(int i = 1 ; i <= n ; i++){ sum += i; } System.out.println(); System.out.println("Sum of first n number is :: " + sum); } }