#include <fstream>

using namespace std;

ifstream in ("ciur.in");
ofstream out ("ciur.out");

int main()
{
    int n,i,x=0,xn=0,j=0,contor=0;
    in>>n;
    for (i=2;i<n;i++)
    {
        if (i%2!=0)
        {
            if (i%3!=0)
            {
                if (i%5!=0)
                {
                    if (i%7!=0)
                    {
                        contor++;
                    }
                }
            }
        }
    }
    out<<contor+4;
    return 0;
}