Table of Temperatures... Help

[zepel]

I'm trying to create a table that converts Celsius to Fahrenheit, I have to use the main() function and the counter-controlled loop "for". When I put in 21, the program will run all the way until 30. How can I get it to stop at the number the user puts in? I need it to range from 0 to the input number.

# Table of Temperatures

start = 1
end = 31
increment = 1

input("Enter a number: ")
print()

def main():
    print("Celcius \t Farenheit")

    def fahrenheit(T_in_celsius):
        return (T_in_celsius * 9 / 5) + 32

    for t in range (start, end, increment):
        print(t, "\t\t ", fahrenheit(t))


main()