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

// https://yukicoder.me/problems/no/34
class Program
{
    static string InputPattern = "InputX";

    static List<string> GetInputList()
    {
        var WillReturn = new List<string>();

        if (InputPattern == "Input1") {
            WillReturn.Add("3 2 1 1 3 1");
            WillReturn.Add("0 2 0");
            WillReturn.Add("0 1 0");
            WillReturn.Add("0 0 0");
            //4
            //遠回りすれば体力を減らさずに着くことができますが、移動回数6が必要です。
            //(1,1)→(2,1)→(3,1) の順に歩くと移動回数2ですが、
            //途中で死んでしまうためダメです。
            //(1,1)→(1,2)→(2,2)→(3,2)→(3,1) の順に歩くのが、
            //死なない範囲で最も早く着くことができます。
        }
        else if (InputPattern == "Input2") {
            WillReturn.Add("4 25 1 1 4 4");
            WillReturn.Add("0 1 3 3");
            WillReturn.Add("1 4 1 5");
            WillReturn.Add("2 2 7 8");
            WillReturn.Add("6 7 4 9");
            //-1
            //どのような経路でも途中で死んでしまうため、次の街へ着くことができません
        }
        else if (InputPattern == "Input3") {
            WillReturn.Add("21 40 15 1 18 21");
            WillReturn.Add("0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0");
            WillReturn.Add("9 4 3 9 0 4 4 3 0 8 7 0 2 2 2 3 8 1 2 1 2");
            WillReturn.Add("2 5 6 3 4 9 1 2 2 6 6 8 0 1 1 0 9 8 4 6 3");
            WillReturn.Add("6 5 0 7 9 9 7 2 9 4 3 0 9 7 5 9 0 4 1 9 5");
            WillReturn.Add("3 9 2 1 8 4 7 9 8 0 3 9 5 1 2 1 2 5 9 8 1");
            WillReturn.Add("0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0");
            WillReturn.Add("5 1 7 9 5 2 3 0 4 0 8 4 4 8 5 4 2 8 3 8 6");
            WillReturn.Add("3 9 6 7 3 0 4 1 9 5 1 2 2 3 0 8 0 6 6 4 4");
            WillReturn.Add("3 6 6 6 7 4 5 3 0 6 7 3 5 1 9 3 0 5 9 9 9");
            WillReturn.Add("8 1 1 4 2 5 9 3 2 4 1 8 4 6 3 5 5 3 3 6 4");
            WillReturn.Add("0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0");
            WillReturn.Add("5 5 7 7 9 2 8 4 5 6 4 6 8 2 7 3 5 8 5 2 4");
            WillReturn.Add("9 0 7 7 0 4 1 6 1 9 1 5 0 1 6 5 2 6 6 6 5");
            WillReturn.Add("3 9 7 7 2 6 3 7 1 5 3 8 9 5 6 3 4 8 7 3 4");
            WillReturn.Add("8 9 1 0 3 9 4 3 9 1 4 8 1 0 5 9 4 3 6 1 3");
            WillReturn.Add("0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0");
            WillReturn.Add("9 5 0 0 4 9 3 9 6 5 4 2 1 5 9 8 7 8 8 6 3");
            WillReturn.Add("7 2 3 9 9 9 7 7 0 5 8 0 6 3 6 1 2 3 1 0 5");
            WillReturn.Add("7 8 1 1 8 5 4 3 5 0 2 5 8 5 3 5 3 4 1 0 7");
            WillReturn.Add("7 1 8 1 2 0 5 8 1 3 9 6 1 3 8 3 9 4 8 6 8");
            WillReturn.Add("0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0");
            //33
        }
        else {
            string wkStr;
            while ((wkStr = Console.ReadLine()) != null) WillReturn.Add(wkStr);
        }
        return WillReturn;
    }

    struct JyoutaiDef
    {
        internal int CurrX;
        internal int CurrY;
        internal int CurrV;
        internal int Level;
    }

    // 枝切りで使う情報
    struct EdakiriInfo
    {
        internal int CurrV;
        internal int Level;
    }

    static void Main()
    {
        List<string> InputList = GetInputList();

        int[] wkArr = { };
        Action<string> SplitAct = (pStr) =>
            wkArr = pStr.Split(' ').Select(X => int.Parse(X)).ToArray();

        SplitAct(InputList[0]);
        int N = wkArr[0];
        int V = wkArr[1];
        int Sx = wkArr[2], Sy = wkArr[3];
        int Gx = wkArr[4], Gy = wkArr[5];

        int[,] SabakuArr = new int[N + 1, N + 1];
        for (int Y = 1; Y <= N; Y++) {
            SplitAct(InputList[Y]);
            for (int X = 1; X <= N; X++) {
                SabakuArr[X, Y] = wkArr[X - 1];
            }
        }

        var Stk = new Stack<JyoutaiDef>();
        JyoutaiDef WillPush;
        WillPush.CurrX = Sx; WillPush.CurrY = Sy;
        WillPush.CurrV = V;
        WillPush.Level = 0;
        Stk.Push(WillPush);

        int AnswerLevel = int.MaxValue;
        bool FoundAnswer = false;

        var EdakiriInfoListDict = new Dictionary<int, List<EdakiriInfo>>();

        while (Stk.Count > 0) {
            JyoutaiDef Popped = Stk.Pop();

            //クリア処理
            if (Popped.CurrX == Gx && Popped.CurrY == Gy) {
                FoundAnswer = true;
                if (AnswerLevel > Popped.Level) {
                    AnswerLevel = Popped.Level;
                }
                continue;
            }

            Func<int, int, int> DeriveGoalKyori = (pCurrX, pCurrY) =>
                Math.Abs(Gx - pCurrX)
              + Math.Abs(Gy - pCurrY);

            Action<int, int> PushSyori = (pNewX, pNewY) =>
            {
                if (pNewX < 1 || N < pNewX) return;
                if (pNewY < 1 || N < pNewY) return;

                WillPush.CurrX = pNewX;
                WillPush.CurrY = pNewY;
                WillPush.CurrV = Popped.CurrV - SabakuArr[pNewX, pNewY];
                if (WillPush.CurrV <= 0) return;
                WillPush.Level = Popped.Level + 1;

                // 下限値枝切り
                if (FoundAnswer) {
                    if (AnswerLevel <= WillPush.Level
                                     + DeriveGoalKyori(WillPush.CurrX, WillPush.CurrY))
                        return;
                }

                // 枝切り
                int Hash = WillPush.CurrX * 1000 + WillPush.CurrY;
                if (EdakiriInfoListDict.ContainsKey(Hash) == false) {
                    EdakiriInfoListDict[Hash] = new List<EdakiriInfo>();
                }
                bool IsNG = false;
                foreach (EdakiriInfo EachEdakiriInfo in EdakiriInfoListDict[Hash]) {
                    if (EachEdakiriInfo.CurrV >= WillPush.CurrV && EachEdakiriInfo.Level <= WillPush.Level) {
                        IsNG = true;
                        break;
                    }
                }
                if (IsNG) return;

                EdakiriInfo WillAdd;
                WillAdd.CurrV = WillPush.CurrV;
                WillAdd.Level = WillPush.Level;
                EdakiriInfoListDict[Hash].Add(WillAdd);

                // メモ化探索
                Stk.Push(WillPush);
            };

            // ゴールまでのマンハッタン距離で処理を分岐
            if (DeriveGoalKyori(Popped.CurrX, Popped.CurrY) > 1) {
                PushSyori(Popped.CurrX, Popped.CurrY - 1);
                PushSyori(Popped.CurrX, Popped.CurrY + 1);
                PushSyori(Popped.CurrX - 1, Popped.CurrY);
                PushSyori(Popped.CurrX + 1, Popped.CurrY);
            }
            else PushSyori(Gx, Gy);
        }
        Console.WriteLine(FoundAnswer ? AnswerLevel : -1);
    }
}