#include <fstream>
using namespace std;
ifstream f("fractii.in");
ofstream g("fractii.out");
long n,i,j,num=0;
long ver(long x,long y)
{long s;
 s=x%y;
 while(s!=0)
        {
            x=y;
            y=s;
            s=x%y;
        }
 return y;
}
void calc()
{for(i=1;i<=n;i++)
 {for(j=1;j<=n;j++)
     {
      if(ver(i,j)==1) num+=1;
     }
 }
}
int main()
{f>>n;
 calc();
 g<<num;
 f.close();
 g.close();
}