Blowblock

#include<stdio.h>
#include<vector>
#include<algorithm>
using namespace std;
typedef long long int ll;
int main(){
    int n;
    scanf("%d",&n);
    vector<ll> A;
    vector<ll> B;
    vector<ll> C;
    vector<ll> D;
    for(int i = 0 ; i < n ; i ++){
        for(int j = 0 ; j < n ; j ++){
            ll x;
            scanf("%lld",&x);
            if(i%2 == 0){
                if(j%2 == 0){
                    A.push_back(x);
                }else{
                    B.push_back(x);
                }
            }else{
                if(j%2 == 0){
                    C.push_back(x);
                }else{
                    D.push_back(x);
                }
            }
        }
    }
    sort(A.begin(),A.end());
    sort(B.begin(),B.end());
    sort(C.begin(),C.end());
    sort(D.begin(),D.end());
    ll ans = 0;
    while(!A.empty()){
        ans += (A[A.size()-1]*B[B.size()-1]*C[C.size()-1]*D[D.size()-1]);
        A.pop_back();
        B.pop_back();
        C.pop_back();
        D.pop_back();
    }
    printf("%lld",ans);
    return 0;
}