#include <iostream>
using namespace std;

int cmmdc (int a, int b);

int main ()
{
    int n; cin >> n;
    int cnt = 0;
    for (int i = 1; i <= n; i++)
        for (int j = 1; j <= n; j++)
            if (cmmdc (i, j) == 1)
                cnt++;
    cout << cnt;

    return 0;
}

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