import java.util.Scanner;

/*
  Author:  James Tam
  Version: 2015

  Learning objectives: tracing a simple recursive example that sums a series of
  numbers.
*/

public class SumSeries
{
    static int sum(int no) 
    {
        if (no == 1)
            return(1);
        else
            return(no + sum(no-1));
    }

    public static void main(String args []) 
    {
        int last = -1;
        int total = -1;
        Scanner in = new Scanner(System.in);
        System.out.print("Enter the last number: ");
        last = in.nextInt();
        total = sum(last);
        System.out.println("The sum of the series from " +
          "1 to " + last + " is " + total);
    }
}