N,K = map(int, input().split())
S =  []
black = 0
for _ in range(N*2):
    S.append(list(input()))
    black+=S[-1].count('#')
C = []
ALL = []
for _ in range(N*2):
    C.append(list(map(int, input().split())))
    ALL.extend(C[-1])
ALL.sort(reverse=True)
ans = sum(ALL[:black])
if black%2==0:
    MIRROR = []
    for i in range(N*2):
        for j in range(N):
            MIRROR.append(C[i][j]+C[i][2*N-j-1])
    MIRROR.sort(reverse=True)
    ans = max(ans,sum(MIRROR[:black//2])+K)

print(ans)