import java.io.IOException;
import java.util.InputMismatchException;
import java.util.PriorityQueue;

public class Main {
	int n, v;
	int sx, sy, gx, gy;
	int[][] g;
	int max;

	class D implements Comparable<D> {
		int x, y;
		int r;
		int min;

		public D(int x, int y, int r, int min) {
			this.x = x;
			this.y = y;
			this.r = r;
			this.min = min;
		}

		@Override
		public int compareTo(D o) {
			if (this.min != o.min) {
				return this.min - o.min;
			}
			if (this.x != o.x) {
				return this.x - o.x;
			}
			if (this.y != o.y) {
				return this.y - o.y;
			}
			if (this.r != o.r) {
				return this.r - o.r;
			}
			return 0;
		}

		@Override
		public String toString() {
			return "(" + x + ", " + y + ", " + r + ", " + min + ")";
		}
	}

	int dijkstra() {
		PriorityQueue<D> queue = new PriorityQueue<D>();
		queue.add(new D(sx, sy, v, 0));
		boolean[][][] vis = new boolean[n][n][v + 1];

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

		while (!queue.isEmpty()) {
			D d = queue.poll();
			int x = d.x;
			int y = d.y;
			int r = d.r;
			int min = d.min;

			if (vis[x][y][r]) {
				continue;
			}
			vis[x][y][r] = true;
			if (x == gx && y == gy) {
				return min;
			}

			int mhd = Math.abs(gx - x) + Math.abs(gy - y);
			if (mhd * max < r) {
				queue.add(new D(gx, gy, 1, min + mhd));
				continue;
			}

			for (int i = 0; i < 4; i++) {
				int nx = x + dx[i];
				int ny = y + dy[i];
				if (nx < 0 || n <= nx || ny < 0 || n <= ny) {
					continue;
				}
				int nr = r - g[ny][nx];
				if (nr <= 0) {
					continue;
				}
				int nmin = min + 1;
				if (!vis[nx][ny][nr]) {
					queue.add(new D(nx, ny, nr, nmin));
				}
			}
		}

		return -1;
	}

	void run() {
		MyScanner sc = new MyScanner();

		n = sc.nextInt();
		v = sc.nextInt();
		sx = sc.nextInt() - 1;
		sy = sc.nextInt() - 1;
		gx = sc.nextInt() - 1;
		gy = sc.nextInt() - 1;
		g = new int[n][n];
		max = 0;
		for (int i = 0; i < n; i++) {
			for (int j = 0; j < n; j++) {
				g[i][j] = sc.nextInt();
				max = Math.max(max, g[i][j]);
			}
		}

		System.out.println(dijkstra());
	}

	public static void main(String[] args) {
		new Main().run();
	}

	public void mapDebug(int[][] a) {
		System.out.println("--------map display---------");
		for (int i = 0; i < a.length; i++) {
			for (int j = 0; j < a[i].length; j++) {
				System.out.printf("%3d ", a[i][j]);
			}
			System.out.println();
		}
		System.out.println("----------------------------" + '\n');
	}

	class MyScanner {
		int read() {
			try {
				return System.in.read();
			} catch (IOException e) {
				throw new InputMismatchException();
			}
		}

		boolean isSpaceChar(int c) {
			return c == ' ' || c == '\n' || c == '\r' || c == '\t' || c == -1;
		}

		boolean isEndline(int c) {
			return c == '\n' || c == '\r' || c == -1;
		}

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

		int[] nextIntArray(int n) {
			int[] array = new int[n];
			for (int i = 0; i < n; i++)
				array[i] = nextInt();
			return array;
		}

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

		long[] nextLongArray(int n) {
			long[] array = new long[n];
			for (int i = 0; i < n; i++)
				array[i] = nextLong();
			return array;
		}

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

		double[] nextDoubleArray(int n) {
			double[] array = new double[n];
			for (int i = 0; i < n; i++)
				array[i] = nextDouble();
			return array;
		}

		String next() {
			int c = read();
			while (isSpaceChar(c))
				c = read();
			StringBuilder res = new StringBuilder();
			do {
				res.appendCodePoint(c);
				c = read();
			} while (!isSpaceChar(c));
			return res.toString();
		}

		String[] nextStringArray(int n) {
			String[] array = new String[n];
			for (int i = 0; i < n; i++)
				array[i] = next();

			return array;
		}

		String nextLine() {
			int c = read();
			while (isEndline(c))
				c = read();
			StringBuilder res = new StringBuilder();
			do {
				res.appendCodePoint(c);
				c = read();
			} while (!isEndline(c));
			return res.toString();
		}
	}
}