# 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()