#include <fstream>

using namespace std;
int euclid(int a, int b)
{
    int c;
    while (b)
    {
        c = a % b;
        a = b;
        b = c;
    }
    return a;
}
int main()
{
    ifstream cin("fractii.in");
    ofstream cout("fractii.out");
    int n, cnt = 0;
    cin >> n;
    for(int i = 1; i <= n; i ++)
    {
        for(int j  = 1; j <= n; j ++)
        {
            if(euclid(i, j) == 1)
            {
                cnt++;
            }
        }
    }
    cout << cnt;
    return 0;
}