#include <cstdio>
#include <cstdint>
#include <cmath>
#include <cstring>
#include <iostream>
#include <iomanip>
#include <vector>
#include <map>
#include <unordered_map>
#include <set>
#include <unordered_set>
#include <queue>
#include <algorithm>
#include <numeric>
#include <cassert>
using namespace std;
namespace atcoder{};using namespace atcoder;

using ull = uint64_t;
using ll = int64_t;
using vi = vector<int>;
using vll = vector<ll>;
using vs = vector<string>;
using ld = long double;
using P = pair<ll,ll>;
using G = vector<vector<int>>;

#ifdef MYDEBUG
#define LO(...) fprintf(stderr, __VA_ARGS__)
#define debug(x) cerr << "\033[33m(line:" << __LINE__ << ") " << #x << ": " << x << "\033[m" << endl
#else
#define LO(...) (void)0
#define debug(x) (void)0
#endif

#define reps(i,a,n) for(ll i##_len = (ll)(n), i = (a); i < i##_len; ++i)
#define rep(i,n) reps(i,0,n)
#define rrep(i,n) reps(i,1,n+1)
#define repd(i,n) for(ll i=n-1;i>=0;i--)
#define rrepd(i,n) for(ll i=n;i>=1;i--)

#define inp(i) ll i; cin >> i;
#define inps(s) string s; cin >> s;
#define inpp(p) cin >> (p).first >> (p).second
#define inpv(v,N) vll v(N);rep(i,N)cin>>v[i];
#define inpg(g,N,M) g.resize(N);rep(i,M){inp(a);inp(b);a--,b--;g[a].push_back(b);g[b].push_back(a);}
#define all(v) begin(v),end(v)
#define YESNO(b) cout<<(b?"YES\n":"NO\n")
#define yesno(b) cout<<(b?"yes\n":"no\n")
#define YesNo(b) cout<<(b?"Yes\n":"No\n")
#define YES cout<<"YES\n"
#define NO cout<<"NO\n"
#define yes cout<<"yes\n"
#define no cout<<"no\n"
#define Yes cout<<"Yes\n"
#define No cout<<"No\n"

#define SP cout << " "
#define ENDL cout << "\n"
#define ou(i) cout << (i)
#define ous(i) cout << (i) << " "
#define oul(i) cout << (i) << "\n"
#define setfp() cout << fixed << setprecision(16)

template<typename C> void ouv(const C &v){for(auto &&e:v){cout << e;if(&e != &v.back()) cout << ' ';}cout << "\n";}
template<typename C> void ouvadd(const C &v){for(auto &&e:v){cout << e+1;if(&e != &v.back()) cout << ' ';}cout << "\n";}

template<class T>bool chmax(T &a, const T &b) { if (a<b) { a=b; return 1; } return 0; }
template<class T>bool chmin(T &a, const T &b) { if (b<a) { a=b; return 1; } return 0; }

inline ll lg(ll __n) { return sizeof(ll) * __CHAR_BIT__ - 1 - __builtin_clzl(__n); }

int dx[8]={1,0,-1,0,1,-1,-1,1};
int dy[8]={0,1,0,-1,1,1,-1,-1};

int main(){
    inp(N);
    inp(K);
    vector<string> m(2*N);
    ll black = 0;
    rep(i,2*N){
        cin>>m[i];
        rep(j,2*N){
            black += m[i][j]=='#';
        }
    }
    vector c(2*N,vll(2*N));
    vector d(2*N,vll(2*N));
    vll a(2*N*2*N);
    vll b(N*2*N);
    rep(i,2*N){
        rep(j,2*N){
            cin>>c[i][j];
            a[i*2*N+j] = c[i][j];
            d[i][j] = c[i][j];
            if(j >= N){
                d[i][2*N-1-j] += d[i][j];
                b[i*N+2*N-1-j] = d[i][2*N-1-j];
            }
        }
    }
    sort(all(a));
    ll ans = 0;
    rep(i,black){
        ans += a[2*N*2*N - i - 1];
    }
    if(black % 2 == 0){
        sort(all(b));
        ll ans2 = K;
        rep(i,black/2){
            ans2 += b[b.size() -1 -i];
        }
        chmax(ans, ans2);
    }
    oul(ans);

    return 0;
}