using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Введите x");

        double x = Convert.ToDouble(Console.ReadLine()); 

        if ( 'x' >= 0)

        { double t = Math.Sin('x'); 

        Console.WriteLine("{0}", t );}

        else 

        { double t = Math.Pow(x, 3);

        Console.WriteLine("{0}", t );}

    }

}