What value is printed by the Mystery program?

public class Mystery {
    public static int mystery(int n) {
        if(n <= 2) {
            return n;
        }
        return mystery(n - 1) + mystery(n - 2) - mystery(n - 3);
    }
    public static void main(String[] args) {
        System.out.println(mystery(4));
    }
}