#include <iostream>
#include <vector>
#include <set>
#include <map>
#include <queue>
#include <algorithm>
#include <cstring>
#include <cstdio>
#include <fstream>
#include <sstream>
using namespace std;
typedef long long ll;

const int INF = 1 << 20;

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

struct State {
    int x, y, v, d;
    bool operator>(const State& other) const {
        return d > other.d;
    }
};

int dist[100][100][2000];
int getDist(int x, int y, int v){
    int d = dist[x][y][v];
    if(d == -1){
        return INF;
    } else {
        return d;
    }
}

int N, V, Sx, Sy, Gx, Gy;
int in[110][110];

int solve(){
    if(V >= 9 * N * 2){
        return abs(Sx - Gx) + abs(Sy - Gy);
    }
    
    memset(dist, -1, sizeof(dist));
    priority_queue<State, vector<State>, greater<State> > Q;
    
    Q.push(State{Sx, Sy, V, 0});
    dist[Sx][Sy][V] = 0;
    
    while(!Q.empty()){
        State s = Q.top(); Q.pop();
        int x = s.x, y = s.y, v = s.v, d = s.d;
        
        if(x == Gx && y == Gy){
            return d;
        }
        
        for(int i=0;i<4;i++){
            int ny = y + dy[i];
            int nx = x + dx[i];
            if(ny < 0 || ny >= N || nx < 0 || nx >= N)continue;
            
            int nv = v - in[nx][ny];
            if(nv <= 0)continue;
            
            int nd = d + 1;
            if(nd >= dist[nx][ny][nv])continue;
            
            Q.push(State{nx, ny, nv, nd});
            dist[nx][ny][nv] = nd;
        }
    }
    
    return -1;
}

int main(){
    cin >> N >> V >> Sx >> Sy >> Gx >> Gy;
    
    --Sx; --Sy;
    --Gx; --Gy;
    
    for(int y=0;y<N;y++)for(int x=0;x<N;x++){
        cin >> in[x][y];
    }
    
    cout << solve() << endl;
    return 0;
}