#include <stdio.h>
#include <bits/stdc++.h>
#include <atcoder/all>
using namespace atcoder;
using mint = modint998244353;
using namespace std;
#define rep(i,n) for (int i = 0; i < (n); ++i)
#define Inf 1000000

int dis[101][101][6000];

int main(){
	
	int n,v,sx,sy,gx,gy;
	cin>>n>>v>>sx>>sy>>gx>>gy;
	gx--;gy--;sx--;sy--;
	swap(sx,sy);
	swap(gx,gy);
	
	vector l(n,vector<int>(n));
	rep(i,n){
		rep(j,n)cin>>l[i][j];
	}
	
	rep(i,n){
		rep(j,n){
			rep(k,6000)dis[i][j][k] = 0;
		}
	}
	
	queue<pair<pair<int,int>,int>> Q;
	Q.emplace(make_pair(sx,sy),0);
	dis[sx][sy][0] = v;
	vector<int> dx = {1,-1,0,0},dy = {0,0,1,-1};
	while(Q.size()>0){
		int xx = Q.front().first.first, yy = Q.front().first.second,dd = Q.front().second;
		Q.pop();
		if(dd==5999)continue;
		rep(i,4){
			int nx = xx + dx[i];
			int ny = yy + dy[i];
			if(nx<0||nx>=n||ny<0||ny>=n)continue;
			int nd = dd+1;
			if(dis[nx][ny][nd] < dis[xx][yy][dd] - l[nx][ny]){
				dis[nx][ny][nd] = dis[xx][yy][dd] - l[nx][ny];
				Q.emplace(make_pair(nx,ny),nd);
			}
		}
	}
	
	int ans = Inf;
	rep(i,6000){
		if(dis[gx][gy][i] >= 1){
			ans = i;
			break;
		}
	}
	if(ans==Inf)ans = -1;
	cout<<ans<<endl;
	
	return 0;
}