#include <iostream>
#include <fstream>
#include <algorithm>
using namespace std;
ifstream fin("fractii.in");
ofstream fout("fractii.out");
int n;
long long total;

int main() {
    fin >> n;
    for (int i = 1; i <= n; ++i)
        for (int j = 1; j <= n; ++j)
            if (__gcd(i, j) == 1)
                ++total;
    fout << total;
    return 0;
}