#include<bits/stdc++.h>
#define rep(i,n) for(int i=0;i<(n);++i)
#define reps(i,n) for(int i=1;i<=(n);++i)
#define repr(i,n) for(int i=2;i*i<=(n);++i)
#define ll long long
#define all(x) (x).begin(),(x).end()
#define sz(x) ((string)(x).size())
#define pb push_back
#define pob pop_back()
#define MMod (ll)1000000007
#define mmod (ll)998244353
#define setp(x) setprecision((ll)(x))
#define INF (ll)(1000000000000000000)
using namespace std;
using vi=vector<int>;
using vc=vector<char>;
using vb=vector<bool>;
using vl=vector<long long>;
using vvi=vector<vi>;
using vvl=vector<vl>;
using vvc=vector<vc>;
using vvb=vector<vb>;
using vpi=vector<pair<int,int>>;
using vpl=vector<pair<ll,ll>>;
using vs=vector<string>;
using pii=pair<int, int>;
using pll=pair<ll,ll>;
using pqi=priority_queue<int>;

int main(){
  int n; cin>>n;
  vvl p(n,vl(6));
  ll res=0;
  rep(i,n)rep(j,6) cin>>p[i][j];
  rep(i,6){
    for(int j=i+1;j<6;++j){
      vi x;
      ll point=1;
      rep(k,6){
        int a=0,b=0;
        if(k!=i&&k!=j){
          rep(l,n){
            if(p[l][k]>=a) {
              a=p[l][k];
              b=l;
            }
          }
          point*=a;
          x.pb(b);
        }
      }
      ll s=0,t=0;
      for(ll l:x){
        s=max(s,p[l][i]);
        t=max(t,p[l][j]);
      }
      point*=s*t;
      res=max(res,point);
    }
  }
  cout<<res<<endl;
}