# file: factorial.py
#
# This program calculates the factorial of an inputed positive integer
# n!=1*2*3*...*(n-2)(n-1)n
#


def main():
    print("This program computes the factorial of the inputed number")
    n = int(input("Please, input a positive integer number:"))
    factorial=1
    
    for factor in range(1,n+1):
        factorial = factorial*factor
        #print("factor=", factor, ";",factor, "! =",factorial)

    print(n,"! =", factorial)

main()