#include <iostream>
#include <fstream>

using namespace std;

int main()
{long i, j, n, nr=0, c, a, b ;

    ifstream f("fractii.in");
    f>>n;

    for(i=2;i<=n;i++)
     for(j=2;j<=n;j++)
      {
          a=i;
          b=j;

       while (b)
    {
       c = a % b;
       a = b;
       b = c;
    }
      if(a==1) nr++;
      }

    ofstream g("fractii.out");
            g<<nr+n*2;
        f.close();
        g.close();


    return 0;
}