from math import isqrt

def divisors(n):
  r = isqrt(n - 1) + 1
  small, large = [], []
  for i in range(1, r):
    if n % i == 0:
      small.append(i)
      large.append(n//i)
  if r**2 == n: small.append(r)
  return small + large[::-1]

N = int(input())
D = divisors(N)
print(N - len(D))