#include<fstream.h>
long int i,j,nr,n;
long int cmmdc(long int x,long int y)
{
 if(x>y)
  return cmmdc(x-y,y);
 if(x<y)
  return cmmdc(x,y-x);
 return x;
}
int main()
{
  ifstream f("fractii.in");
  ofstream g("fractii.out");
   f>>n;
   for(i=1;i<=n;i++)
    for(j=1;j<=n;j++)
     if(cmmdc(i,j)==1)
      nr++;
   g<<nr;
 return 0;
}