#pragma GCC optimize("Ofast")
#include <iostream>
#include <vector>
#include <algorithm>
#include <map>
#include <queue>
#include <cstdio>
#include <ctime>
#include <assert.h>
#include <chrono>
#include <random>
#include <numeric>
#include <set>
#include <deque>
#include <stack>
#include <sstream>
#include <utility>
#include <cstring>
#include <unordered_map>
#include <unordered_set>
#include <tuple>
#include <array>
#include <bitset>
using namespace std;
typedef long long int ll;
typedef unsigned long long ull;

mt19937_64 rng(chrono::steady_clock::now().time_since_epoch().count());
ll myRand(ll B) {
    return (ull)rng() % B;
}
inline double time() {
    return static_cast<long double>(chrono::duration_cast<chrono::nanoseconds>(chrono::steady_clock::now().time_since_epoch()).count()) * 1e-9;
}

int main(){
    cin.tie(nullptr);
    ios::sync_with_stdio(false);
    int n; cin >> n;
    ll K; cin >> K;
    vector<string> s(2*n);
    int cnt = 0;
    for(int i=0;i<2*n;i++){
        cin >> s[i];
        for(char c:s[i]){
            if(c == '#') cnt++;
        }
    }
    vector<int> v,vv;
    vector<vector<int>> c(2*n,vector<int>(2*n));
    for(int i=0;i<2*n;i++){
        for(int j=0;j<2*n;j++){
            cin >> c[i][j];
            v.push_back(c[i][j]);
            if(j >= n){
                vv.push_back(c[i][j]+c[i][2*n-1-j]);
            }
        }
    }
    ll res = 0;
    sort(v.rbegin(), v.rend());
    for(int i=0;i<cnt;i++){
        res += v[i];
    }
    ll res2 = 0;
    if(cnt%2 == 0){
        sort(vv.rbegin(), vv.rend());
        for(int i=0;i<cnt/2;i++){
            res2 += vv[i];
        }
        res2 += K;
    }
    cout << max(res,res2) << endl;
}