#include <iostream>
#include <fstream>
using namespace std;


int cmmmdc(int a , int b){

    while(a!=b)
        if(a>b) a-=b;
           else b-=a;

    return a;
    }

int main()
{

   ifstream f("fractii.in");
   ofstream g("fractii.out");

   int n,nr=0;
   f>>n;
   for (int i=1;i<=n;i++)
      for(int j=1;j<=n;j++)
           if(cmmmdc(i,j)==1)  nr++;

    g<<nr;

    f.close();
    g.close();

    return 0;
}