using System;

public class Program

{

    public static void Main()

    {

        double n = 202;

        double m = 15;

        double y = 1;

        for(int k = 1; k <=20; k++)

        {

            y *= k*m/Math.Pow(2,k) + 1;

        }

        Console.WriteLine("Ответ y = {0}", Math.Round(y,2));

​

​

    }

}