#include <fstream.h>
long n,p,q,sol;

ifstream f ("fractii.in");
ofstream g ("fractii.out");

int verifica(int x, int y)
{if (x%y==0) return 0;
  else
   if (y%x==0) return 0;
     else
      return 1;
}

int main()
{f>>n;
sol=n*2-1;
for (int i=2;i<=n;i++)
  for (int j=2;j<=n;j++)
    if ( verifica (i,j) ) sol++;
g<<sol;
return 1;
}