include <bits/stdc++.h>

using namespace std;

int main() {

int n,c=0;
cin>>n;
for (int i=1;i<n;i++){
    if (i%2!=0){
        c++;
    }
    else if(i%3!=0){
        c++;
    }
    else if (i%5!=0){
        c++;
    }
}
cout<<c;

}