#include <iostream>
#include <fstream>

using namespace std;

int main()
{   int n,i,nr;
    ifstream f("ciur.in");
    ofstream g("ciur.out");
    f>>n;nr=0;
    for(i=1;i<=n;i++)
    {
            if(i%2!=0&&i%3!=0&&i%5!=0)
                nr++;
            if(i==2||i==3)
                nr=nr+1;
    }
    g<<nr;


    return 0;
}