N,K = map(int,input().split())
S = [input() for _ in range(N + N)]
C = [list(map(int,input().split())) for _ in range(N + N)]

black = 0
for s in S:
    for u in s:
        if u == "#":
            black += 1

l = []
for c in C:
    for u in c:
        l.append(u)
l.sort(reverse = True)
ans = sum(l[:black])
ans2 = K
ll = []
for i in range(N + N):
    for j in range(N):
        ll.append(C[i][j] + C[i][2 * N - 1 - j])
ll.sort(reverse = True)
if black % 2 == 0:
    ans2 += sum(ll[:black // 2])
    if ans2 > ans:
        ans = ans2
print(ans)