using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Введите X");

        int X = Convert.ToInt32(Console.ReadLine());

        double Y = 12.4 * Math.Sin(X / 2.1) - 8.3 * Math.Cos(1.2 * X);

        Console.WriteLine("y равно " + Math.Round(Y,5));

        Console.ReadLine();

    }

}