import sys
input = sys.stdin.readline

n, k = map(int, input().split())
S = [list(input()) for _ in range(2 * n)]
C = [list(map(int, input().split())) for _ in range(2 * n)]

num = 0
L = []
for i in range(2 * n):
    for j in range(2 * n):
        L.append(C[i][j])
        if S[i][j] == '#':
            num += 1
L.sort(reverse=True)
ans = sum(L[:num])
if num > 0 and num % 2 == 0:
    LL = []
    for i in range(2 * n):
        for j in range(n):
            LL.append(C[i][j] + C[i][2 * n - j - 1])
    LL.sort(reverse=True)
    ans = max(ans, sum(LL[:num // 2]) + k)
print(ans)