#include <bits/stdc++.h>
int main() {
  long long n;
  while (scanf("%lld", &n) != EOF) {
    printf("%lld\n", n - n / 2 - n / 3 - n / 5 - n / 7 + n / 6 + n / 10 +
                         n / 14 + n / 15 + n / 21 + n / 35 - n / 30 - n / 42 -
                         n / 70 - n / 105 + n / 210);
  }
  return 0;
}
