#include<iostream>
#include<fstream>
using namespace std;

int main(){
long n, p, q, fr;
ifstream f("fractii.in");
ofstream g("fractii.out");
f>>n;
fr=0;
for (p=1; p<=n; p++){
    for (q=1; q<=n; q++){
      if ((p<q)&&(q%p!=0)) fr++;
      else if ((p>q)&&(p%q!=0)) fr++;
      if ((p==1)||(q==1)) fr++;
    }
}
g<<"\n"<<fr;
f.close();
g.close();

return 0;
}