#include <bits/stdc++.h> 
#include <atcoder/all>
#define pub push_back
#define eb emplace_back
#define mp make_pair
#define fi first
#define se second
#define rep(i, n) rep2(i, 0, n)
#define rep2(i, m, n) for (ll i = m; i < (n); i++)
#define per(i, b) per2(i, 0, b)
#define per2(i, a, b) for (ll i = int(b) - 1; i >= int(a); i--)
#define ALL(c) (c).begin(), (c).end()
using namespace std;
using namespace atcoder;
using ll = long long;
using Pll = pair<ll, ll>;
using mint = modint998244353;
using mint2 = modint1000000007;

constexpr long long INF = (1LL << 60);

template <typename T>
bool chmax(T& a, const T& b) {
    if (a < b) {
        a = b;  // aをbで更新
        return true;
    }
    return false;
}

template <typename T>
bool chmin(T& a, const T& b) {
    if (a > b) {
        a = b;  // aをbで更新
        return true;
    }
    return false;
}

template <typename T>
T square(T x) {
    return x * x;
}

std::string zfill(int n, const int width)
{
    std::stringstream ss;
    ss << std::setw(width) << std::setfill('0') << n;
    return ss.str();
}

bool IsPrime(int num)
{
    if (num < 2) return false;
    else if (num == 2) return true;
    else if (num % 2 == 0) return false; // 偶数はあらかじめ除く

    double sqrtNum = sqrt(num);
    for (int i = 3; i <= sqrtNum; i += 2)
    {
        if (num % i == 0)
        {
            // 素数ではない
            return false;
        }
    }

    // 素数である
    return true;
}

template<typename T = int>
std::map<T, ll> factorize(T n) {
    std::map<T, ll> factor_map;
    for (T i = 2; i * i <= n; i++) {
        while (!(n % i)) {
            factor_map[i]++; n /= i;
        }
    }
    if (n > 1) factor_map[n]++;
    return factor_map;
}


/*  divisor(n)
    入力：整数 n
    出力：nのすべての約数
    計算量：O(√n)
*/
vector<long long> divisor(long long n) {
    vector<long long> ret;
    for (long long i = 1; i * i <= n; i++) {
        if (n % i == 0) {
            ret.push_back(i);
            if (i * i != n) ret.push_back(n / i);
        }
    }
    sort(ret.begin(), ret.end()); // 昇順に並べる
    return ret;
}


int main(void) {
    ll N; cin >> N;
    ll ans = 0;
    rep(a, 10) {
        rep(b, 10) {
            if (a == b) {
                continue;
            }
            ll high = 1000000001; ll low = 0;
            while (high > low) {
                ll mid = (high + low) / 2;
                if (mid * mid - a * N * mid - N * b - 1 < 0) {
                    low = mid;
                }
                else {
                    high = mid;
                }
                if (high == low + 1) { break;}
            }
            ll p = max((ll)2, max(a + 1, b + 1));
            ans += max((ll)0, low - p + 1);
            
        }
    }
    cout << ans << endl;
}