N,K = map(int,input().split())

kuro = 0
for i in range(N*2):
    tmp = input()
    kuro+=tmp.count("#")

score = []
score2 = []

for i in range(N*2):
    tmp2 = list(map(int,input().split()))
    for j in range(N):
        score2.append(tmp2[j]+tmp2[-1-j])
        score.append(tmp2[j])
        score.append(tmp2[-1-j])

score2.sort()
score2.reverse()
score.sort()
score.reverse()

if kuro%2 == 1:
    ans = sum(score[:kuro])
else:
    tmpans1 = sum(score[:kuro])
    tmpans2 = sum(score2[:(kuro//2)])+K
    ans = max(tmpans1,tmpans2)

print(ans)