The factorial of n (written n!) is the product of the integers between 1 and n. So 4! = 1*2*3*4 = 24. By definition 0! = 1. The factorial is not defined for negative numbers. Develop a program that asks for a positive integer (20), and calculates and displays the factorial. Note that the calculation of the factorial is similar to the sum of the integers between 1 and N but with multiplication instead of addition (and very similar to the product of 1 to N). But remember to output a value for 0. Develop the algorithm for you only. Translate the algorithm into Python. The program should ask the user for a positive number, call calculateFact() to get the factorial and print the result. The algorithm/function calculate Fact() calculates the factorial.