import sys
input = sys.stdin.readline

N,K=map(int,input().split())
S=[input().strip() for i in range(2*N)]
C=[list(map(int,input().split())) for i in range(2*N)]

b=0
for i in range(2*N):
    for j in range(2*N):
        if S[i][j]=="#":
            b+=1

CX=[]
for c in C:
    CX+=c[:]

ANS1=sum(sorted(CX,reverse=True)[:b])

CY=[]

for i in range(2*N):
    for j in range(N):
        CY.append(C[i][j]+C[i][2*N-1-j])

ANS2=sum(sorted(CY,reverse=True)[:b//2])+K

if b%2==1:
    ANS2=-1<<100

print(max(ANS1,ANS2))