import java.io.*; import java.util.*; import java.util.stream.*; public class Main { public static void main(String[] args) throws Exception { Scanner sc = new Scanner(); int n = sc.nextInt(); long k = sc.nextLong(); int count = 0; for (int i = 0; i < n * 2; i++) { for (char c : sc.next().toCharArray()) { if (c == '#') { count++; } } } int[] syms = new int[n * n * 2]; PriorityQueue queue = new PriorityQueue<>(); for (int i = 0; i < 2 * n; i++) { for (int j = 0; j < 2 * n; j++) { int x = sc.nextInt(); queue.add(-x); if (j >= n) { syms[i * n + 2 * n - j - 1] -= x; } else { syms[i * n + j] -= x; } } } long ans = 0; for (int i = 0; i < count; i++) { ans -= queue.poll(); } if (count % 2 == 0) { long sum = 0; Arrays.sort(syms); for (int i = 0; i < count / 2; i++) { sum -= syms[i]; } ans = Math.max(ans, sum + k); } System.out.println(ans); } } class Utilities { static String arrayToLineString(Object[] arr) { return Arrays.stream(arr).map(x -> x.toString()).collect(Collectors.joining("\n")); } static String arrayToLineString(int[] arr) { return String.join("\n", Arrays.stream(arr).mapToObj(String::valueOf).toArray(String[]::new)); } } class Scanner { BufferedReader br = new BufferedReader(new InputStreamReader(System.in)); StringTokenizer st = new StringTokenizer(""); StringBuilder sb = new StringBuilder(); public Scanner() throws Exception { } public int nextInt() throws Exception { return Integer.parseInt(next()); } public long nextLong() throws Exception { return Long.parseLong(next()); } public double nextDouble() throws Exception { return Double.parseDouble(next()); } public int[] nextIntArray() throws Exception { return Stream.of(br.readLine().split(" ")).mapToInt(Integer::parseInt).toArray(); } public String next() throws Exception { while (!st.hasMoreTokens()) { st = new StringTokenizer(br.readLine()); } return st.nextToken(); } }