Write a program that can accept one input, a positive integer. The program should calculate the factorial value for that number. In mathematical terms, the factorial of a number N is the product of positive integers between 1 and N. So for instance: 4 factorial = (1 * 2* 3 * 4) = 24 5 factorial = (1 * 2 * 3 * 4 * 5) = 120 6 factorial = (1 * 2*3* 4*5* 6) = 720 7 factorial = (1 * 2 * 3 * 4* 5*6* 7) = 5040 Use a while-loop to calculate and print the factorial for the input number. For instance: Enter factorial to calculate: 5 factorial = 120 Name the program prep9.py. Make sure that gradescope gives you the points for passing the test case(s)