#include <fstream>
using namespace std;

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

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

    return a;
}

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;
}