using System;

​

public class Program

{

    public static void Main()

    {

        int x = 22;

        int y = 41;

        Console.WriteLine(Math.Max(x, y));

        Console.WriteLine(Math.Sqrt(64));

        Console.WriteLine(Math.Round(2.6));

        string greeting = "Hello";

        string firstName = "Philip";

        string lastName = "Popov";

        string name = firstName + lastName;

        Console.WriteLine(name);

        string myString = "Hello";

        Console.WriteLine(myString[0]);

        string txt = "Hello World";

        Console.WriteLine(txt.Length);

        Console.WriteLine(txt.ToUpper());

    }

}