# import pypyjit
# pypyjit.set_param('max_unroll_recursion=-1')
from collections import *
from itertools import *
from functools import *
import math,sys
input = sys.stdin.readline

N,K = map(int,input().split())
S = [list(input())[:-1] for _ in range(2*N)]
C = [list(map(int,input().split())) for _ in range(2*N)]
X = 0
for i in range(2*N):
    S[i] = [int(j=='#') for j in S[i]]
    X += sum(S[i])
ans = 0
Y = []
for i in range(2*N):
    for j in range(2*N):
        Y.append(C[i][j])
Y.sort()
ans = sum(Y[-X:])

if X%2==1:
    print(ans)
    exit()

x = X//2
Y = []
for i in range(2*N):
    for j in range(N):
        Y.append(C[i][j]+C[i][-1-j])
Y.sort()
tmp = sum(Y[-x:])+K
print(max(ans,tmp))