#include<fstream.h>
int cmmdc(int a,int b)
{
    int r;
    while(b)
    {
     r=a%b;
     a=b;
     b=r;
    }
   return a;
}
int main()
{
 ifstream fin("fractii.in");
 ofstream fout("fractii.out");
 int n;
 fin>>n;
 int i,j,nr=0;
 for(i=1;i<=n;i++)
   for(j=1;j<=n;j++)
   {
              if(cmmdc(i,j)==1)
                   nr++;      
   }
 fout<<nr;
 fout.close();
 fin.close();
 return 0;
}