public class TakeAwayGame {

    private int nSticks = 21;

    public TakeAwayGame() { }

    public TakeAwayGame(int n) {
        nSticks = n;
    }
    
    public void takeAway(int n) {
        nSticks = nSticks - n;
    }

    public int sticksLeft() {
        return nSticks;
    }
}