#include <fstream>

using namespace std;

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

int euclid(int a, int b) {
    int c;
    while (b) {
        c = a%b;
        a = b;
        b = c;
    }
    return a;
}

int N;
int nr = 1;

int main()
{

    fin >> N;

    for (int i = 1; i <= N; i++)
        for (int j = 1; j <= N; j++) {
            if (i == j)
                continue;
            if (euclid(i,j) == 1)
                nr++;
        }

    fout << nr;

    return 0;
}