static void Main()
{
Customer Pesho = new Individual("Pesho", 42);
DepositAccount naPesho = new DepositAccount(Pesho, 1245.123M, 0.06M);
Customer IBM = new Company("IBM", 34);
MortgageAccount naIBM = new MortgageAccount(IBM, 12345152412, 0.23M);
Console.WriteLine(naPesho.CalculateAmountFor(13));
Console.WriteLine(naIBM.CalculateAmountFor(14));
Account a = new LoanAccount(Pesho, 123123, 32);
Console.WriteLine(a.CalculateAmountFor(6));
}