#include <bits/stdc++.h>
using namespace std;
using ll = long long;
ll F(ll N, ll a, ll b, ll mu) {
    return mu * mu - (N * a * mu) - N * b - 1;
}
int main () {
    ll N;
    cin >> N;
    ll ans = 0;
    for (ll a = 0; a < 10; a ++) {
        for (ll b = 0; b < 10; b ++) {
            if (a == b) {
                continue;
            }
            ll ok = N * a;
            ll ng = (ll)1e18;
            while (abs(ok - ng) > 1) {
                ll mu = (ok + ng) / 2;
                if (F(N, a, b, mu) < 0) {
                    ok = mu;
                } else {
                    ng = mu;
                }
            }
            ans += max(0ll, ok - max(a, b));
        }
    }
    cout << ans << endl;
}