#pragma GCC target("avx")
#pragma GCC optimize("O3")
#pragma GCC optimize("unroll-loops")

#include <bits/stdc++.h>
using namespace std;

#define rep(i,n) for(int i = 0; i < (int)n; i++)
#define FOR(n) for(int i = 0; i < (int)n; i++)
#define repi(i,a,b) for(int i = (int)a; i < (int)b; i++)
#define pb push_back
#define all(x) x.begin(),x.end()
//#define mp make_pair
#define vi vector<int>
#define vvi vector<vi>
#define vll vector<ll>
#define vvll vector<vll>
#define vs vector<string>
#define vvs vector<vs>
#define vc vector<char>
#define vvc vector<vc>
#define pii pair<int,int>
#define pllll pair<ll,ll>
#define vpii vector<pair<int,int>>
#define vpllll vector<pair<ll,ll>>
#define vpis vector<pair<int,string>>
#define vplls vector<pair<ll, string>>
#define vpsi vector<pair<string, int>>
#define vpsll vector<pair<string, ll>>

template<typename T>
void chmax(T &a, const T &b) {a = (a > b? a : b);}
template<typename T>
void chmin(T &a, const T &b) {a = (a < b? a : b);}

using ll = long long;
using ld = long double;
using ull = unsigned long long;

const ll INF = numeric_limits<long long>::max() / 2;
const ld pi = 3.1415926535897932384626433832795028;
const ll mod = 998244353;
int dx[] = {-1, 0, 1, 0, -1, -1, 1, 1};
int dy[] = {0, -1, 0, 1, -1, 1, -1, 1};

#define int long long

void solve() {
    int n, k;
    cin >> n >> k;
    n *= 2;
    vector<string> s(n);
    FOR(n) cin >> s[i];
    vvi c(n, vi(n));
    rep(i, n) rep(j, n) cin >> c[i][j];

    int cnt = 0;
    rep(i, n) rep(j, n) if(s[i][j] == '#') cnt++;

    vi sorted;
    for(auto e : c) for(auto f : e) sorted.push_back(f);
    sort(all(sorted), greater<int>());
    int ans = 0;
    FOR(cnt) ans += sorted[i];

    if(cnt%2==0) {
        vi combined;
        rep(i, n) {
            rep(j, n/2) {
                combined.push_back(c[i][j]+c[i][n-1-j]);
            }
        }
        sort(all(combined), greater<int>());
        int ans1 = k;
        FOR(cnt/2) ans1 += combined[i];

        chmax(ans, ans1);
    }

    cout << ans << endl;
}

signed main() {
    cin.tie(nullptr);
    ios::sync_with_stdio(false);
    solve();
    return 0;
}