n,k = map(int,input().split())
s = [list(input()) for _ in range(2*n)]
c = [tuple(map(int,input().split())) for _ in range(2*n)]
b_cnt = sum(e.count("#") for e in s)
cc = []
for i in range(2*n):
    for j in c[i]:
        cc.append(j)
cc.sort(reverse = True)
ans = sum(cc[:b_cnt])
if not b_cnt & 1:
    cc = []
    for i in range(2*n):
        for j in range(n):
            cc.append(c[i][j] + c[i][n-j])
    cc.sort(reverse = True)
    ans = max(ans,sum(cc[:b_cnt//2]) + k)
print(ans)