static void Main(string[] args)
{
var office = new Office();
var p1 = new Person("Дима");
var p2 = new Person("Илья");
var p3 = new Person("Андрей");
office.AddPerson(p1);
office.AddPerson(p2);
office.AddPerson(p3);
p1.EnterToOffice();
p2.EnterToOffice();
p3.EnterToOffice();
p2.LeaveOffice();
p1.LeaveOffice();
p3.LeaveOffice();
}