import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.PrintStream;
import java.io.PrintWriter;
import java.util.ArrayDeque;
import java.util.Arrays;
import java.util.Iterator;
import java.util.Queue;


public class Main_yukicoder34 {

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        Printer pr = new Printer(System.out);

        int[] dx = {1, -1, 0, 0};
        int[] dy = {0, 0, 1, -1};

        int n = sc.nextInt();
        int v = sc.nextInt();
        int sx = sc.nextInt() - 1;
        int sy = sc.nextInt() - 1;
        int gx = sc.nextInt() - 1;
        int gy = sc.nextInt() - 1;

        int[][] l = new int[n][n];

        for (int i = 0; i < n; i++) {
        	for (int j = 0; j < n; j++) {
        		l[i][j] = sc.nextInt();
        	}
        }

        int[][] vv = new int[n][n];
        Queue<Integer> qx = new ArrayDeque<>();
        Queue<Integer> qy = new ArrayDeque<>();
        Queue<Integer> qv = new ArrayDeque<>();
        qx.add(sx);
        qy.add(sy);
        qv.add(v);
        vv[sy][sx] = v;

        for (int cnt = 0; true; cnt++) {
            Queue<Integer> qxtmp = new ArrayDeque<>();
            Queue<Integer> qytmp = new ArrayDeque<>();
            Queue<Integer> qvtmp = new ArrayDeque<>();

        	while (!qx.isEmpty()) {
        		int x = qx.remove();
        		int y = qy.remove();
        		int vtmp = qv.remove();

        		if (x == gx && y == gy && vtmp > 0) {
        			pr.println(cnt);

        			pr.close();
        			sc.close();
        			return;
        		}

        		for (int i = 0; i < dx.length; i++) {
        			int nx = x + dx[i];
        			int ny = y + dy[i];

        			if (nx >= 0 && nx < n && ny >= 0 && ny < n) {
        				int nv = vtmp - l[ny][nx];
        				if (nv > 0 && nv > vv[ny][nx]) {
        					qxtmp.add(nx);
        					qytmp.add(ny);
        					qvtmp.add(nv);
        					vv[ny][nx] = nv;
        				}
        			}
        		}
        	}

        	if (!qxtmp.isEmpty()) {
//        		pr.println(qxtmp.size());
        		qx = qxtmp;
        		qy = qytmp;
        		qv = qvtmp;
        	} else {
        		break;
        	}
        }

        pr.println(-1);

        pr.close();
        sc.close();
    }

	@SuppressWarnings("unused")
	private static class Scanner {
		BufferedReader br;
		Iterator<String> it;

		Scanner (InputStream in) {
			br = new BufferedReader(new InputStreamReader(in));
		}

		String next() throws RuntimeException  {
			try {
				if (it == null || !it.hasNext()) {
					it = Arrays.asList(br.readLine().split(" ")).iterator();
				}
				return it.next();
			} catch (IOException e) {
				throw new IllegalStateException();
			}
		}

		int nextInt() throws RuntimeException {
			return Integer.parseInt(next());
		}

		long nextLong() throws RuntimeException {
			return Long.parseLong(next());
		}

		float nextFloat() throws RuntimeException {
			return Float.parseFloat(next());
		}

		double nextDouble() throws RuntimeException {
			return Double.parseDouble(next());
		}

		void close() {
			try {
				br.close();
			} catch (IOException e) {
//				throw new IllegalStateException();
			}
		}
	}

	private static class Printer extends PrintWriter {
		Printer(PrintStream out) {
			super(out);
		}
	}
}