#include <bits/stdc++.h>
int main() {
  long long n, sum;
  scanf("%I64d", &n);
  sum = 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;
  printf("%I64d\n", sum);
  return 0;
}
