int[] tab = new int[0];
        int dlugosc = 0;

        

        public void Push(int x)
        {
            dlugosc++;
            int[] temp = new int[dlugosc];
            temp[dlugosc-1] = x;
            for(int i = 0; i < dlugosc-1; i++)
            {
                temp[i] = tab[i];
            }

            tab = temp;
        }

        public int Pop()
        {
            int a = tab[0];
            int[] temp = new int[dlugosc-1];
            for(int i = 1; i < dlugosc; i++)
            {
                temp[i - 1]=tab[i];
            }
            dlugosc--;

            tab = temp;

            return a;
        }

        public int Length()
        {
            return dlugosc;
        }

        public void Show()
        {
            for(int i = 0; i < dlugosc; i++)
            {
                Console.Write(tab[i] + ", ");
            }
            Console.WriteLine();
        }