#include<fstream>
#include<cmath>
using namespace std;
ifstream fin("fractii.in");
ofstream fout("fractii.out");
int main()
{int N,fr;
fin>>N;
fr = N;
for(int i=2;i<=N;i++)
{
    for(int k=1;k<=N;k++)
        if(k==1)
            fr++;
        else if((k%2==0 && i%2 == 0) || (k%3==0 && i%3==0) || (k%5==0 && i%5==0))
            fr=fr;
        else if(i%k!=0 && k%i!=0)
            fr++;
            
        
}
fout<<fr;
fin.close();
fout.close();
return 0;
}