#!/usr/bin/python

import random

total = 0;
good = 0;

for n in xrange(1,100000000):
	i = random.randint(0,99999999)
	s = "{0:0>8}".format(i);
	a = {}
	for c in list(s):
		if c in a.keys():
			a[c]+=1;
		else:
			a[c]=1;
		if 4 in a.values():
			good+=1;
	if n % 100000 == 0:
		ratio = good/float(n)
		print "%.4f = %d / %d"%(ratio,good,n)