#include <fstream>
using namespace std;
ifstream f("fractii.in");
ofstream g("fractii.out");
int main(){
    int n,i,j,k,div,fr;
    f>>n;
    fr=0;
    for(i=1;i<=n;i++)
    {
        for(j=1;j<=n;j++)
        {
            div=0;
            for(k=1;k<=n;k++)
            {
                if(i%k==0&&j%k==0)
                   {div++;
                    if(div==2) break;}
            }
            if(div==1)
                fr++;
            div=0;
            }
        }
        g<<fr;
    }