import java.util.*;

public class Main {
	public static void main (String[] args) {
		Scanner sc = new Scanner(System.in);
		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[][] costs = new int[n][n];
		int[][] counts = new int[n][n];
		ArrayList<ArrayList<TreeMap<Integer, Integer>>> values = new ArrayList<>();
		for (int i = 0; i < n; i++) {
		    Arrays.fill(counts[i], Integer.MAX_VALUE);
		    for (int j = 0; j < n; j++) {
		        costs[i][j] = sc.nextInt();
		    }
		}
		PriorityQueue<Path> queue = new PriorityQueue<>();
		queue.add(new Path(sx, sy, 0, v));
		while (queue.size() > 0) {
		    Path p = queue.poll();
		    p.value -= costs[p.y][p.x];
		    if (p.value <= 0) {
		        continue;
		    }
		    if (counts[p.y][p.x] <= p.count) {
		        continue;
		    }
		    counts[p.y][p.x] = p.count;
		    if (p.x > 0) {
		        queue.add(new Path(p.x - 1, p.y, p.count + 1, p.value));
		    }
		    if (p.x < n - 1) {
		        queue.add(new Path(p.x + 1, p.y, p.count + 1, p.value));
		    }
		    if (p.y > 0) {
		        queue.add(new Path(p.x, p.y - 1, p.count + 1, p.value));
		    }
		    if (p.y < n - 1) {
		        queue.add(new Path(p.x, p.y + 1, p.count + 1, p.value));
		    }
		}
		if (counts[gy][gx] == Integer.MAX_VALUE) {
		    System.out.println(-1);
		} else {
		    System.out.println(counts[gy][gx]);
		}
	}
	
	static class Path implements Comparable<Path> {
	    int x;
	    int y;
	    int count;
	    int value;
	    
	    public Path(int x, int y, int count, int value) {
	        this.x = x;
	        this.y = y;
	        this.count = count;
	        this.value = value;
	    }
	    
	    public int compareTo(Path another) {
	        if (value == another.value) {
	            return count - another.count;
	        } else {
	            return another.value - value;
	        }
	    }
	}
}