using System;
using System.Collections.Generic;

namespace No34{
    public class Program{
        public static void Main(string[] args){
            var sr = new StreamReader();
            //---------------------------------
            var N = sr.Next<int>();
            var V = sr.Next<int>();
            var Sx = sr.Next<int>() - 1;
            var Sy = sr.Next<int>() - 1;
            var Gx = sr.Next<int>() - 1;
            var Gy = sr.Next<int>() - 1;
            var L = sr.Next<int>(N, N);

            Func<int, int, bool> isInside = (x, y) => 0 <= x && x < N && 0 <= y && y < N;
            var dx = new[]{0, 1, 0, -1};
            var dy = new[]{1, 0, -1, 0};

            var dist = new int[V + 1, N, N];
            var que = new Queue<int>();

            dist[V, Sx, Sy] = 1;
            que.Enqueue(V);
            que.Enqueue(Sx);
            que.Enqueue(Sy);

            while(que.Count > 0){
                var v = que.Dequeue();
                var x = que.Dequeue();
                var y = que.Dequeue();

                for(var i = 0; i < 4; i++){
                    var nx = x + dx[i];
                    var ny = y + dy[i];
                    if(isInside(nx, ny)){
                        var nv = v - L[ny][nx];
                        if(nv <= 0) continue;
                        if(dist[nv, nx, ny] != 0 && dist[nv, nx, ny] <= dist[v, x, y] + 1) continue;

                        que.Enqueue(nv);
                        que.Enqueue(nx);
                        que.Enqueue(ny);
                        dist[nv, nx, ny] = dist[v, x, y] + 1;
                    }
                }
            }

            var min = int.MaxValue;
            for(var i = 0; i <= V; i++){
                if(dist[i, Gx, Gy] != 0) min = Math.Min(min, dist[i, Gx, Gy]);
            }
            Console.WriteLine(min != int.MaxValue ? min - 1 : -1);
            //---------------------------------
        }
    }

    public class StreamReader{
        private readonly char[] _c = {' '};
        private int _index = -1;
        private string[] _input = new string[0];

        public T Next<T>(){
            if(_index == _input.Length - 1){
                _index = -1;
                while(true){
                    string rl = Console.ReadLine();
                    if(rl == null){
                        if(typeof(T).IsClass) return default(T);
                        return (T)typeof(T).GetField("MinValue").GetValue(null);
                    }
                    if(rl != ""){
                        _input = rl.Split(_c, StringSplitOptions.RemoveEmptyEntries);
                        break;
                    }
                }
            }
            return (T)Convert.ChangeType(_input[++_index], typeof(T), System.Globalization.CultureInfo.InvariantCulture);
        }

        public T[] Next<T>(int x){
            var ret = new T[x];
            for(var i = 0; i < x; ++i) ret[i] = Next<T>();
            return ret;
        }

        public T[][] Next<T>(int y, int x){
            var ret = new T[y][];
            for(var i = 0; i < y; ++i) ret[i] = Next<T>(x);
            return ret;
        }
    }
}