#include <bits/stdc++.h>
using namespace std;
int dp[100][100][1800];
int mx[]={1,-1,0,0},my[]={0,0,1,-1};
int n;
bool check(int x,int y){
	if(0>x||n<=x)	return false;
	if(0>y||n<=y)	return false;
	return true;
}
int main(){
	int v,sx,sy,gx,gy;	cin>>n>>v>>sx>>sy>>gx>>gy;
	sx--;	sy--;	gx--;	gy--;
	int data[n][n];
	for(int i=0;i<n;i++){
		for(int j=0;j<n;j++)	cin>>data[i][j];
	}
	for(int i=0;i<100;i++){
		for(int j=0;j<100;j++){
			for(int k=0;k<1800;k++)	dp[i][j][k]=1<<30;
		}
	}
	dp[sy][sx][0]=0;
	queue<tuple<int,int,int> > q;
	q.push(make_tuple(sx,sy,0));
	while(!q.empty()){
		auto now=q.front();	q.pop();
		int nx=get<0>(now),ny=get<1>(now),cost=get<2>(now);
		if(nx==gx&&ny==gy){
			cout<<dp[ny][nx][cost]<<endl;
			return 0;
		}
		for(int i=0;i<4;i++){
			if(check(nx+mx[i],ny+my[i])){
				if(cost+data[ny+my[i]][nx+mx[i]]>=v)	continue;
				int nex=nx+mx[i],ney=ny+my[i];
				if(dp[ney][nex][cost+data[ney][nex]]>dp[ny][nx][cost]+1){
					dp[ney][nex][cost+data[ney][nex]]=dp[ny][nx][cost]+1;
					q.push(make_tuple(nex,ney,cost+data[ney][nex]));
				}
			}
		}
	}
	cout<<-1<<endl;
	return 0;
}