#include <iostream>
#include <fstream>

using namespace std;

int cmmdc(int a, int b)
{ int r;
  while (b!=0)
  { r=a%b;
    a=b;
    b=r;
  }
 return a;
}

int main()
{  int n,i,j,ct=0;
   ifstream f("fractii.in");
   ofstream g("fractii.out");
   f >> n;
    for (i=1;i<=n;i++)
     for (j=1;j<=n;j++)
      if (cmmdc(i,j)==1)
        ct++;
    g << ct;
 return 0;
}