public int Be(double p)
        {
            double x1 = new Random().NextDouble();
            //System.Windows.Forms.MessageBox.Show(Convert.ToString(x1));
            if (x1 < p)
                return 1;
            else
                return 0;
            
        }
        public int Bi(double p, int N)
        {
            int y = 0;
            for (int i = 0; i < N; i++)
                y = y + Be(p);
            return y;
        }