/**
 * Created by iyasuwatts on 10/17/17.
 */
import java.util.Scanner; 
public class Main {

    public static void Main(String[] args){
        Scanner in = new Scanner(System.in);
        System.out.println("Please enter your number here: ");

        int n = in.nextInt(); 
        int sum = 0; 
        for (int i = 1; i <= n; i++){
            sum += i;

        }
        System.out.println("The sum of numbers between 1 and " + n + " is " + sum);
    }
}