import sys
input=lambda:sys.stdin.readline().rstrip()
N,K=map(int,input().split())
black=0
A=[0 for i in range(4*N**2)]
B=[0 for i in range(2*N**2)]
for i in range(2*N):
	black+=input().count('#')
for i in range(2*N):
	temp=list(map(int,input().split()))
	for j in range(2*N):
		A[i*2*N+j]=temp[j]
	for j in range(N):
		B[i*N+j]=temp[j]+temp[2*N-1-j]
A=sorted(A,key=lambda x:-x)
B=sorted(B,key=lambda x:-x)
ans=sum(A[:black])
if black%2==0:
	ans=max(ans,sum(B[:black//2])+K)
print(ans)