import java.util.Scanner;

public class Main{

public static void main(String[] args){

  Scanner stdin = new Scanner(System.in);

  int num, sum = 0;

  System.out.println("Please enter a number");
  num = stdin.nextInt();

  for(int i=1; i<=num; i++){
    sum+=i;
  }
  System.out.println("The sum of the numbers 1 to " + num + " = " + sum);
 }
}