#!/usr/bin/env python3
# -*- coding: utf-8 -*-

def fact(n):
    if n == 1:
        return 1
    return n*fact(n-1)

print(fact(5))
print(fact(100))

def fact(n):
    return fact_iter(n,1)

def fact_iter(num,product):
    if num = 1:
        return product
    return fact_iter(num-1,num*product)


