# This program prompts for information about a
# loan and computes the monthly mortgage payment.

def main():
    # obtain values
    print("Monthly Mortgage Payment Calculator")
    loan = float(input("Loan amount? "))
    years = int(input("Number of years? "))
    rate = float(input("Interest rate? "))

    # compute payment result
    n = 12 * years
    c = rate / 12.0 / 100.0
    payment = loan * c * (1 + c) ** n / ((1 + c) ** n - 1)
    
    # report result to user
    print()
    print("Monthly payment is: $", round(payment, 2))

main()