#include <bits/stdc++.h>
using namespace std;

ifstream fin("fractii.in");
ofstream fout("fractii.out");

int n;

int Cmmdc(int a, int b)
{
    while(b)
    {
        int r = a % b;
        a = b;
        b = r;
    }
    return a;
}

int main()
{
    fin >> n;

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

    fout << nr;

    fin.close();
    fout.close();
    return 0;
}