def makediv(n):
	lower_divisors , upper_divisors = [], []
	i = 1
	while i*i <= n:
		if n % i == 0:
			lower_divisors.append(i)
			if i != n // i:
				upper_divisors.append(n//i)
		i += 1
	return lower_divisors + upper_divisors[::-1]

n = int(input())
ans = 0
for d in makediv(n):
	if d > 1:
		ans -= 1
ans += n - 1
print(ans)