import sys
import numpy as np


def main():
    buf = sys.stdin.buffer
    n, k = map(int, buf.readline().split())
    n2 = 2 * n
    S = np.empty((n2, n2), np.bool_)
    for i in range(n2): S[i] = np.frombuffer(buf.readline().rstrip(), 'S1') == b'#'
    C = np.empty_like(S, np.int64)
    for i in range(n2):
        C[i] = np.fromstring(buf.readline().rstrip().decode(), np.int64, sep=' ')
    m = np.count_nonzero(S)

    def f(A, x):
        return sum(np.sort(A.ravel())[-x:].tolist())

    ans = f(C, m)
    if ~m & 1:
        ans = max(ans, f(C[:, :n] + np.fliplr(C[:, n:]), m // 2) + k)
    print(ans)



if __name__ == '__main__':
    main()