#include <bits/stdc++.h>

using namespace std;
ifstream f("fractii.in");
ofstream g("fractii.out");
int nr,n,P,Q;
int cmmdc(int a,int b)
{
    int r;
    while(b!=0)
    {
        r=a%b;
        a=b;
        b=r;
    }
    return a;
}
int main()
{
   f>>n;
  for(Q=1;Q<=n;Q++)
  {
  for(P=1;P<=n;P++)
   {
       if(cmmdc(P,Q)==1)
        nr++;
   }
  }
   g<<nr;
    return 0;
}