#include <fstream.h>

int main()
{
      ifstream f("fractii.in");
      ofstream fout("fractii.out");
      int n;
      register int c = 0;
      f>>n;
      for (int i = 1; i <=n; i++)
              for (int y = 1; y <= n; y++) {
                  if(i == 1 || y == 1)
                       c++;
                  else
                       if( i%y != 0 && y%i != 0)
                           c++;
             }
      fout<<c;
      return 0;
}