#include <bits/stdc++.h>

using namespace std;
void fast_io() {
    ios::sync_with_stdio(false);
    std::cin.tie(nullptr);
}
int main() {
    fast_io();
    int n;
    long long k;
    cin >> n >> 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]) {
            cnt += c == '#';
        }
    }
    vector<vector<long long>> c(2 * n, vector<long long>(2 * n));
    for (int i = 0; i < 2 * n; i++) {
        for (int j = 0; j < 2 * n; j++) {
            cin >> c[i][j];
        }
    }
    vector<long long> vals, vals_sym;
    for (int i = 0; i < 2 * n; i++) {
        for (int j = 0; j < 2 * n; j++) {
            vals.push_back(c[i][j]);
        }
    }
    for (int i = 0; i < 2 * n; i++) {
        for (int j = 0; j < n; j++) {
            vals_sym.push_back(c[i][j] + c[i][2 * n - j - 1]);
        }
    }
    sort(vals.rbegin(), vals.rend());
    sort(vals_sym.rbegin(), vals_sym.rend());
    long long ans = 0;
    for (int i = 0; i < cnt; i++) {
        ans += vals[i];
    }
    if (cnt % 2 == 0) {
        long long tmp = k;
        for (int i = 0; i < cnt / 2; i++) {
            tmp += vals_sym[i];
        }
        ans = max(ans, tmp);
    }
    cout << ans << endl;
}