#include <iostream>
#include <fstream>

using namespace std;

int gcd(int a, int b) {
    while (b != 0) {
        int t = b;
        b = a % b;
        a = t;
    }
    return a;
}

int main() {
    ifstream in("fractii.in");
    ofstream out("fractii.out");

    int N;
    in >> N;

    int count = 0;
    for (int P = 1; P <= N; P++) {
        for (int Q = 1; Q <= N; Q++) {
            if (gcd(P, Q) == 1) {
                count++;
            }
        }
    }

    out << count << endl;

    return 0;
}