using System;

using System.Linq;

public class Program

{

    public static void Main()

    {

        var ip = parseIP("2.2.2.2");

        var range = parseIP("2.2.2.0");

        var mask = 30;

        Console.WriteLine((ip ^ range) >> (32 - mask));

    }

    private static int parseIP(string IPNumber) 

    {

        int res = 0;

        string[] elements = IPNumber.Split(new Char[] {'.'});

        if (elements.Length==4) {

            res  = Convert.ToInt32(elements[0])<<24;

            res += Convert.ToInt32(elements[1])<<16;

            res += Convert.ToInt32(elements[2])<<8;

            res += Convert.ToInt32(elements[3]);

        }

        return res;

    }

}