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

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

int main() {
    int N;
    cin >> N;
    
    int r = nr(N);
    cout << r;
    
    return 0;
}