//Question4.java

public class Question4
{
    public static void main(String[] args)
    {
        System.out.println(mysteryValue(3));
    }

    public static int mysteryValue
    (
        int n
    )
    {
        if (n <= 1)
            return 1;
        else
            return (mysteryValue(n - 1) + n);
    }
}