/* -*- coding: utf-8 -*-
 *
 * 2480.cc:  No.2480 Sequence Sum - yukicoder
 */

#include<cstdio>
#include<algorithm>
 
using namespace std;

/* constant */

/* typedef */

/* global variables */

/* subroutines */

/* main */

int main() {
  int n;
  scanf("%d", &n);

  int c = 0;
  for (int p = 1; p * p <= n; p++)
    if (n % p == 0) {
      int q = n / p;
      c += (p != q) ? 2 : 1;
    }

  printf("%d\n", n - c);

  return 0;
}