#include <bits/stdc++.h>
using namespace std;

/*
 *
 * a, bを全探索
 *
 * a, b : [0, min(p, 10) - 1]
 *
 * x > 1 / N
 * N * x > 1
 *
 * x = (p * a + b) / (p ^ 2 - 1)
 *
 * ((p * a + b) * N) / (P ^ 2 - 1) > 1
 *
 * (p * a + b) * N > p ^ 2 - 1
 *
 * 成り立つpを二分探索
 * -> [ok, ng)
 *
 * (p, a, b) (max(a, b) + 1 <= p <= ok)
 *
 * 
 *
 */

int main() {
    int n;
    cin >> n;

    long long ans = 0;
    for (int a = 0; a < 10; a++) {
        for (int b = 0; b < 10; b++) {
            if (a == b) {
                continue;
            }
            int left = max(a, b) + 1;
            int ok = left - 1, ng = 1e9 + 1;

            while (ng - ok > 1) {
                long long p = (ok + ng) / 2;
                if ((p * a + b) * n > p * p - 1) {
                    ok = p;
                } else {
                    ng = p;
                }
            }

            ans += ok - left + 1;
        }
    }

    cout << ans << endl;
}