#include <iostream>
#include <fstream>
using namespace std;
ifstream fin("fractii.in");
ofstream fout("fractii.out");
int cmmdc (int a,int b)
{
    if(a==b) return a;
      else if(a>b) return cmmdc(a-b,b);
          else  return cmmdc(a,b-a);
}


int main ()
{
  int i,j,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;
}