import numpy as np
n,k=list(map(int,input().split()))
s=[]
c=[]
for i in range(n*2):
    s.extend(input().split())
for j in range(n*2):
    c.append(list(map(int,input().split())))
b=s.count("#")
m=np.array(c)
o=m.flatten()
a=o.sort()
os=sum(a[:b])
if b%2==1:
    print(os)
else:
    p=m[:,:n]+m[:,:n:2*n][::-1]
    q=p.flatten()
    r=q.sort()
    qs=sum(r[:b])+k
    print(max(qs,os))