using System;

public class Program

{

    public static int GetSquare(int x)

    {

        return 5 * (x * x) - (3 * x) + 4;

    }

​

    public static double GetSquare(double x)

    {

        return 5 * (x * x) - (3 * x) + 4;

    }

    public static void Main()

    {

        var xInteger = GetSquare(2);        

        var xDouble = GetSquare(2.1);

​

        Console.WriteLine(xInteger.ToString());     

        Console.WriteLine(xDouble.ToString());

​

​

​

​

    }

}