N = int(input())

import sys
if N == 1:
	print(0)
	exit()
	
ans = N
C = 10 ** 5
t = 1
for i in range(2,C):
	if N % i == 0:
		count = 0
		while N % i == 0:
			count += 1
			N //= i
		t *= (count + 1)
print(ans - t)