//https://infoarena.ro/problema/fractii
#include <iostream>
#include <fstream>
using namespace std;

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

int cmmdc(int a, int b);

int main()
{
    int n, cnt = 0;
    fin >> n;

    for (int i = 1; i <= n; i++)
        for (int j = 1; j <= n; j++)
            if (cmmdc(i, j) == 1)
                cnt++;
    fout << cnt;

    return 0;
}

int cmmdc(int a, int b)
{
    int aux = a % b;
    while (aux)
    {
        a = b;
        b = aux;
        aux = a % b;
    }

    return b;
}