static void Main(string[] args)
{
var client = new LibraryClient();
client.IntroduceYourself(5, "Вася");
List <int> arr = new List <int> {
1, 2, 3
};
client.ChooseNewBooks(arr);
client.HandOverBooks(new List <int> {
2, 3
});
client.ChooseNewBooks(arr);
client.ApplayChanges();
client.GoAway();
Console.ReadKey();
}
