#include <bits/stdc++.h>

using namespace std;

typedef pair<int,int> P;
typedef pair<int,pair<int,int>> PP;
typedef long long ll;

const double EPS = 1e-8;
const int INF = 1e9;
const int MOD = 1e9+7;

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

int bfs(vector<vector<int>> L,int sx,int sy,int gx,int gy,int V,vector<vector<vector<bool>>>& used){
	queue<int> qx,qy,qv,qt;
	qx.push(sx);qy.push(sy);qv.push(V);qt.push(0);
	int ret = INF;

	while(!qx.empty()){
		int x,y,v,t;
		x = qx.front();qx.pop();
		y = qy.front();qy.pop();
		v = qv.front();qv.pop();
		t = qt.front();qt.pop();

		if(gy == y && gx == x){
			ret = min(ret,t);
			continue;
		}
		for(int i=0;i<4;i++){
			int nx = x + dx[i],ny = y + dy[i];
			if(nx < 0 || ny < 0 || nx >= L[0].size() || ny >= L.size())continue;
			int nv = v - L[ny][nx];
			if(nv <= 0 || used[ny][nx][nv])continue;
			used[ny][nx][nv] = true;
			qx.push(nx);
			qy.push(ny);
			qv.push(nv);
			qt.push(t + 1);
		}
		//cerr << y << " " << x << " " << v << endl;
	}
	return ret;
}

int main(void) {
	int n,v,sx,sy,gx,gy;
	cin >> n >> v >> sx >> sy >> gx >> gy;
	vector<vector<int>> L(n,vector<int>(n));
	for(int i=0;i<n;i++){
		for(int j=0;j<n;j++){
			cin >> L[i][j];
		}
	}
	sy--;sx--;gy--;gx--;
	vector<vector<vector<bool>>> used(n,vector<vector<bool>>(n,vector<bool>(v+1,false)));
	int ret = bfs(L,sx,sy,gx,gy,v,used);
	cout << (ret>=INF ? -1 : ret) << endl;

	return 0;
}