using System;
using System.Collections.Generic;
using System.Linq;
using System.Diagnostics;

class Program {
    static string ReadLine() { return Console.ReadLine().Trim(); }
    static int ReadInt() { return int.Parse(Console.ReadLine()); }
    static int[] ReadInts() { return ReadLine().Split().Select(int.Parse).ToArray(); }
    static string[] ReadStrings() { return ReadLine().Split(); }

    static int BFS(int n, int vitality, int srow, int scol, int grow, int gcol, int[,] g) {
        var memo = new int[n, n];
        var q = new Queue<Tuple<int, int, int, int>>(); // (row, col, vitality, step)
        q.Enqueue(Tuple.Create(srow, scol, vitality, 0));
        while (q.Count > 0) {
            var t = q.Dequeue();
            int row = t.Item1;
            int col = t.Item2;
            int v = t.Item3;
            int step = t.Item4;

            if (row == grow && col == gcol) return step;

            if (memo[row, col] > 0 && memo[row, col] >= v) continue;
            memo[row, col] = v;

            for (int i = -1; i <= 1; i++) {
                for (int j = -1; j <= 1; j++) {
                    if (Math.Abs(i) + Math.Abs(j) == 1) {
                        int r = row + i;
                        int c = col + j;
                        if (0 <= r && r < n && 0 <= c && c < n) {
                            int v2 = v - g[r, c];
                            if (v2 > 0) {
                                q.Enqueue(Tuple.Create(r, c, v2, step + 1));
                            }
                        }                        
                    }
                }
            }

        }
        return -1;
    }

    static void Main() {
        var xs = ReadInts();
        int n = xs[0];
        int vitality = xs[1];
        int sx = xs[2], sy = xs[3];
        int gx = xs[4], gy = xs[5];

        var g = new int[n, n];
        for (int i = 0; i < n; i++) {
            var s = ReadInts();
            for (int j = 0; j < n; j++) {
                g[i, j] = s[j];
            }
        }

        Console.WriteLine(BFS(n, vitality, sy-1, sx-1, gy-1, gx-1, g));        
    }
}