#include <iostream>
#include <fstream>
using namespace std;
ifstream fin("fractii.in");
ofstream fout("fractii.out");
int cmmdc(int x, int y)
{ while(x!=y)
if(x>y)
x=x-y;
else y=y-x;
return x;
}
int main ()
{
  int i,j;
  long long n,nr=0;
  fin>>n;
  for(i=1;i<=n;i++)
     for(j=1;j<=n;j++)
        if(cmmdc(i,j)==1)
           nr++;
  fout<<nr;
}