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



if __name__ == '__main__':
    main()