#include "bits/stdc++.h"
#include <gmp.h>
using namespace std;

typedef long long ll;
typedef unsigned long long ull;
typedef vector<int> veci;
typedef vector<string> vecs;
template<class T,class U> using Hash=unordered_map<T,U>;

#define REP(i, a, n) for(ll i = a; i < n; i++)
#define RREP(i, a, n) for(ll i = n-1; i >= a; i--)
#define rep(i, n) REP(i, 0, n)
#define rrep(i, n) RREP(i, 0, n)
#define MD 1000000007

template<class T> T read(){T a;cin >> a;return a;}
template<class T> void read(T& a){cin >> a;}
template<class T> void rarr(T a, int n){for(int i = 0; i < n; i++) {cin >> a[i];}}
template<class T> void write(T a){cout << a << endl;}
template<class T> void writes(vector<T> a, const char* c = " "){cout << a[0];for(int i = 1; i < (int)a.size(); i++)cout << c << a[i];cout << endl;;}
void write(double a){cout << fixed << setprecision(12) << a << endl;}
void write(long double a){cout << fixed << setprecision(12) << a << endl;}
template<class T> void warr(T a, int n, const char* c = " "){cout << a[0];for(int i = 1; i < n; i++)cout << c << a[i];cout << endl;}
void split(string s, string delim, veci& result){result.clear();string::size_type pos = 0;while(pos != string::npos){string::size_type p = s.find(delim, pos);if(p == string::npos){result.push_back(atoi(s.substr(pos).data()));break;}else {result.push_back(atoi(s.substr(pos, p - pos).data()));}pos = p + delim.size();}}
void split(string s, string delim, vecs& result){result.clear();string::size_type pos = 0;while(pos != string::npos){string::size_type p = s.find(delim, pos);if(p == string::npos){result.push_back(s.substr(pos));break;}else {result.push_back(s.substr(pos, p - pos));}pos = p + delim.size();}}
ll gcd(ll a, ll b){while(true){ll k = a % b;if(k == 0)return b;a = b;b = k;}}
ll comb(ll n, ll m){ll p=1;m=min(m,n-m);for(ll i=1;i<=m;i++){p*=n-i+1;p/=i;}return p;}

struct Info{
    Info(int x_,int y_,int n_,int v_):x(x_),y(y_),n(n_),v(v_){}
    int x,y;
    int n;
    int v=0;
};

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

int main(void)
{
    int n,v,sx,sy,gx,gy;
    int lv[100][100];
    int mp[100][100]={0};
    int nv[100][100]={0};
    rep(i,100)rep(j,100)nv[i][j]=100*100;
    cin>>n>>v>>sx>>sy>>gx>>gy;
    sx--;sy--;gx--;gy--;
    rep(i,n)rep(j,n)cin>>lv[i][j];
    queue<Info> q;
    mp[sy][sx]=v;
    nv[sy][sx]=0;
    q.push(Info(sx,sy,0,v));
    while(!q.empty()){
        Info t=q.front();
        q.pop();
        rep(i,4){
            int cx=t.x+dx[i];
            int cy=t.y+dy[i];
            if(cx<0||cy<0||cx>=n||cy>=n)continue;
            int cv=t.v-lv[cy][cx];
            int cn=t.n+1;
            if(cv<=0||(cv<=mp[cy][cx]&&cn>=nv[cy][cx]))continue;
            mp[cy][cx]=max(mp[cy][cx],cv);
            nv[cy][cx]=min(nv[cy][cx],cn);
            q.push(Info(cx,cy,cn,cv));
        }
    }
    /*
    rep(i,n){
        rep(j,n)cout<<nv[i][j]<<" ";
        cout<<endl;
    }
    */
    if(mp[gy][gx]==0)nv[gy][gx]=-1;
    write(nv[gy][gx]);
    return 0;
}