static void Main(string[] args)
{
var mobileOperator = new MobileOperator();
var mobileAccount1 = new MobileAccount("Max", "Kh", new DateTime(1998, 6, 23), "*****@*****.**");
var mobileAccount2 = new MobileAccount("Alex", "Kh", new DateTime(1992, 11, 27), "*****@*****.**");
mobileOperator.AddNumber(mobileAccount1);
mobileOperator.AddNumber(mobileAccount2);
Console.WriteLine(mobileAccount1.Number);
Console.WriteLine(mobileAccount2.Number);
mobileAccount1.MakeCall(mobileAccount2.Number);
mobileAccount2.MakeCall(mobileAccount1.Number);
mobileAccount1.SendMessage(mobileAccount2.Number, "Message text");
mobileOperator.Log.MostFrequentlyReceivingNumbers(5);
}