import sys
import numpy as np


def main():
    n, k = map(int, input().split())
    m = 0
    for i in range(2 * n): m += input().count('#')
    C = np.fromstring(sys.stdin.read(), np.int64, sep=' ').reshape(-1, 2 * n)

    def f(A, x):
        if x == 0: return 0
        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()