#include <fstream>
using namespace std;
int n,ans;

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

int gcd(int a, int b)
{
    if (a == 0)
        return b;
    return gcd(b%a, a);
}

int main()
{
    fin >> n;
    for(int i = 1; i <= n; i++){
        for(int j = 1; j <= n; j++){
            if(gcd(i, j) == 1){
                ans++;
            }
        }
    }
    fout << ans << "\n";
    return 0;
}