#include<fstream>

using namespace std;

ifstream fin("fractii.in");
ofstream fout("fractii.out");

int n;

int cmmdc(int a,int b)
{   int r;
    while(a%b)
    {  r=a%b;
       a=b;
       b=r;
    }
    return b;
}   

int main()
{  int c=0,i,j;
   fin>>n;
   for(i=1;i<=n;i++)
		for(j=1;j<=n;j++)
           if(cmmdc(i,j)==1) c++;
   fout<<c;
   fin.close();
   fout.close();
   return 0;
}