private static void Main()
{
var employees = new Employees();
employees.Attach(new Clerk("Stamat", 1231.123, 21));
employees.Attach(new Director("Nafarforii", 2231.123, 26));
employees.Attach(new President("Gazobarov", 3231.123, 30));
Console.WriteLine("Initial status of employees");
var print1 = employees.GetEmployees();
print1.ForEach(Console.WriteLine);
employees.Accept(new IncomeVisitor());
employees.Accept(new VacationVisitor());
Console.WriteLine();
Console.WriteLine("Change status of employees");
print1 = employees.GetEmployees();
print1.ForEach(Console.WriteLine);
}