#include <iostream>
#include <vector>
#include <algorithm>
#include <ctime>
#include <cstdlib>
using namespace std;

int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);

    int N;
    cin >> N;
    srand(314);
    vector<vector<long long>> L(N, vector<long long>(6));
    for (int i = 0; i < N; i++) {
        for (int j = 0; j < 6; j++) {
            cin >> L[i][j];
        }
    }

    auto f = [&](double tt, long long val) {
        vector<long long> A(64);
        vector<long long> B(64);
        for (int s = 0; s < (1 << 6); s++) {
            for (int i = 0; i < N/2; i++) {
                for (int j = i + 1; j < N/2; j++) {
                    long long v = 1;
                    for (int k = 0; k < 6; k++) {
                        if ((s >> k) & 1) {
                            v *= max(L[i][k], L[j][k]);
                        }
                    }
                    A[s] = max(A[s], v);
                }
            }
        }

        for (int s = 0; s < (1 << 6); s++) {
            for (int i = N/2; i < N; i++) {
                for (int j = i + 1; j < N; j++) {
                    long long v = 1;
                    for (int k = 0; k < 6; k++) {
                        if ((s >> k) & 1) {
                            v *= max(L[i][k], L[j][k]);
                        }
                    }
                    B[s] = max(B[s], v);
                }
            }
        }

        long long ans = 0;
        for (int i = 0; i < (1 << 6); i++) {
            ans = max(ans, A[i] * B[63 - i]);
        }
        return ans;
    };

    long long ans = 0;
    double sTime = clock() / CLOCKS_PER_SEC;
    while (clock() / CLOCKS_PER_SEC - sTime < 3.0) {
        random_shuffle(L.begin(), L.end());
        ans = max(ans, f(sTime, ans));
    }
    cout << ans << endl;

    return 0;
}