/* -*- coding: utf-8 -*-
 *
 * 1792.cc:  No.1792 科学の甲子園 - yukicoder
 */

#include<cstdio>
#include<cstring>
#include<algorithm>
 
using namespace std;

/* constant */

const int MAX_N = 10000;
const int M = 6;
const int MBITS = 1 << M;
const int MMSK = MBITS - 1;
const int K = 4;

/* typedef */

typedef long long ll;

/* global variables */

int ps[MAX_N][M];
ll sps[MBITS], dp[2][K + 1][MBITS];

/* subroutines */

inline void setmax(ll &a, ll b) { if (a < b) a = b; }

/* main */

int main() {
  int n;
  scanf("%d", &n);

  for (int i = 0; i < n; i++)
    for (int j = 0; j < M; j++) scanf("%d", ps[i] + j);

  dp[0][0][0] = 1;
  int cur = 0, nxt = 1;

  for (int i = 0; i < n; i++) {
    for (int bits = 0; bits < MBITS; bits++) {
      ll mp = 1;
      for (int j = 0, bj = 1; j < M; j++, bj <<= 1)
	if (bits & bj) mp *= ps[i][j];
      sps[bits] = mp;
    }

    memset(dp[nxt], 0, sizeof(dp[nxt]));

    for (int k = 0; k <= K; k++)
      for (int bits = 0; bits < MBITS; bits++)
	if (dp[cur][k][bits] > 0) {
	  setmax(dp[nxt][k][bits], dp[cur][k][bits]);

	  if (k < K)
	    for (int bits1 = 1; bits1 < MBITS; bits1++)
	      if (! (bits & bits1))
		setmax(dp[nxt][k + 1][bits | bits1],
		       dp[cur][k][bits] * sps[bits1]);
	}

    swap(cur, nxt);
  }

  ll maxd = 0;
  for (int k = 0; k <= K; k++) setmax(maxd, dp[cur][k][MMSK]);

  printf("%lld\n", maxd);
  return 0;
}