#include <stdio.h>
#include <bits/stdc++.h>
#include <atcoder/dsu>
using namespace atcoder;
using namespace std;
#define rep(i,n) for(int i=0;i<(n);i++)
#define Inf 1000000001


int main(){
	
	
	int n;
	cin>>n;
	vector a(n,vector<long long>(6));
	rep(i,n){
		rep(j,6)cin>>a[i][j];
	}
	
	vector dp(5,vector<long long>(1<<6,0));
	dp[0][0] = 1;
	
	rep(i,n){
		vector ndp(5,vector<long long>(1<<6,0));
		rep(cnt,5){
			rep(j,1<<6){
				ndp[cnt][j] = max(ndp[cnt][j],dp[cnt][j]);
				if(cnt==4)continue;
				rep(k,1<<6){
					if(j&k)continue;
					long long v  =dp[cnt][j];
					rep(l,6){
						if((k>>l)&1)v *= a[i][l];
					}
					ndp[cnt+1][j|k] = max(ndp[cnt+1][j|k],v);
				}
			}
		}
		swap(dp,ndp);
	}
	cout<<dp[4].back()<<endl;
				
	
	return 0;
}