#!/usr/bin/python

def fak_rek(n): 
     if n <= 1: 
          return n 
     else: 
          return n*fak_rek(n-1) 

def timing(niter):
	from time import time
	t0 = time()
	n = 0
	while n < niter:
		x = fak_rek(12)
		n = n + 1
	t1 = time()
	return int(1000000*((t1-t0))/niter)

print timing(1000)