#include<iostream>
#include<fstream>
using namespace std;
long int cmmdc (long int a, long int b)
{
    long int r; r=a%b;
    while (r)
    {
        a=b;b=r;r=a%b;
    }
    return b;
}
int main ()
{
    long int N, s=0, i, j;
    ifstream fin ("fractii.in");
    fin>>N;
    fin.close();
    for (i=1;i<=N;i++)
      for (j=1;j<=N;j++)
        if (cmmdc(i,j)==1)
          s++;
    ofstream fout ("fractii.out");
    fout<<s;
    fout.close();
    return 0;
}