N,K = map(int,input().split())
S = [input().strip() for _ in range(2*N)]
C = [list(map(int,input().split())) for _ in range(2*N)]
num = 0
A = []
for i in range(2*N):
    for j in range(2*N):
        if S[i][j]=="#":
            num += 1
        A.append(C[i][j])
A = sorted(A,reverse=True)
ans = sum(A[:num])
if num%2==0:
    B = []
    for i in range(2*N):
        for j in range(N):
            B.append(C[i][j]+C[i][2*N-1-j])
    B = sorted(B,reverse=True)
    ans = max(ans,sum(B[:num//2])+K)
print(ans)