# with open('Gowalla_totalCheckins.txt')as f:
# 	_us = set()
# 	_is = set()
# 	c = set()
# 	for e in f:
# 		es = e.strip().split('\t')
# 		_us.add(es[0])
# 		_is.add(es[4])
# 		c.add((es[0],es[4]))
# 	print(len(_us), len(_is), len(c))

print(3981334/(107092*1280969))
