public OneShip(Pair <int, int> begin, Pair <int, int> end) : base(begin, end) { HP = 1; len = 1; count++; }
public ThreeShip(Pair <int, int> begin, Pair <int, int> end) : base(begin, end) { HP = 3; len = 3; count++; }
public FourShip(Pair <int, int> begin, Pair <int, int> end) : base(begin, end) { HP = 4; len = 4; count++; }
public TwoShip(Pair <int, int> begin, Pair <int, int> end) : base(begin, end) { HP = 2; len = 2; count++; }