#include <bits/stdc++.h>
#include <atcoder/all>
using namespace std;
using namespace atcoder;
#define rep(i,n) for(int i=0;i<(n);i++)
typedef long long ll;
//using mint = modint;
using mint = modint998244353;
using P = pair<int, int>;

const ll INF=1LL<<60, dx[]={0,1,0,-1},dy[]={1,0,-1,0};
bool chmin(ll& a,ll b){if(a>b){a=b; return 1;} return 0;}
bool chmax(ll& a,ll b){if(a<b){a=b; return 1;} return 0;}

int main(){

    int n;
    ll k;
    cin >> n >> k;

    int cnt=0;
    vector<string> s(2*n);
    rep(i,2*n) cin >> s[i];

    rep(i,2*n)rep(j,2*n) if(s[i][j]=='#')cnt++;

    vector<ll> c_1d(4*n*n),c_sum_1d(2*n*n);
    vector<vector<ll>> c(2*n,vector<ll> (2*n));
    vector<vector<ll>> c_sum(2*n,vector<ll> (n));

    rep(i,2*n)rep(j,2*n) cin >> c[i][j];
    rep(i,2*n)rep(j,2*n) c_1d[i*2*n+j]=c[i][j];
    rep(i,2*n)rep(j,n) c_sum[i][j]=c[i][j]+c[i][2*n-1-j];
    rep(i,2*n)rep(j,n) c_sum_1d[i*n+j]=c_sum[i][j];

    sort(c_1d.begin(),c_1d.end());
    sort(c_sum_1d.begin(),c_sum_1d.end());
    
    ll ans=0; 
    rep(i,cnt) ans += c_1d[4*n*n-1-i];
    
    if(cnt%2==0) {
        ll tmp=k;
        rep(i,cnt/2) tmp += c_sum_1d[2*n*n-1-i];
        chmax(ans,tmp);
    }

    cout << ans << endl;
    return 0;
}