N,K = map(int,input().split())
black_count = 0
for _ in range(2*N):
    black_count += input().count("#")
li = []
li_sym = []
for i in range(2*N):
    C = list(map(int,input().split()))
    for j in range(N):
        a = C[j]
        b = C[-j-1]
        li.append(a)
        li.append(b)
        li_sym.append(a+b)

li.sort(reverse=True)
li_sym.sort(reverse=True)
ans = sum(li[:black_count])
if black_count % 2 == 0:
    k = black_count // 2
    ans = max(ans,sum(li_sym[:k])+K)
print(ans)