def number_of_years(l, i):
    n = raw_input(' Enter your the number of years for the loan: ')
    try:
        n = float(n)
        if n > 0:
            print(' Loan amount is {0:.1f} \n'.format(l))
            print(' Interest rate is {0:.4f} \n'.format(i))
            print(' The number of years for the loan is {0:.1f} \n'.format(n))
            m = (l * (i / 100) * n + l) / (n * 12)
            print(' Your monthly payment is {0:.1f}'.format(m))

        else:
            print(' Error 0x666 ')
            number_of_years(l, i)
    except ValueError:
        print(' Error 0x666 ')
        number_of_years(l, i)


def interest_rate(l):
    i = raw_input(' Enter your interest rate: ')
    try:
        i = float(i)
        if i > 0:
            print(' Loan amount is {0:.1f} \n'.format(l))
            print(' Interest rate is {0:.4f} \n'.format(i))
            number_of_years(l, i)
        else:
            print(' Error 0x666 ')
            interest_rate(l)
    except ValueError:
        print(' Error 0x666 ')
        interest_rate(l)


def loan_amount(l):
    try:
        l = float(l)
        if l > 0:
            print(' Loan amount is {0:.1f} \n'.format(l))
            interest_rate(l)
        else:
            print(' Error 0x666 ')
            loan_amount()
    except ValueError:
        print(' Error 0x666 ')
        loan_amount()


print(' Input "q" to quit ')

while True:
    l = raw_input(' Enter your loan amount: ')
    if l == 'q':
        break
    loan_amount(l)
    continue


print(' Thank you for using the app. ')