#include <bits/stdc++.h>
using namespace std;
#define rep(i,n) for(int (i) = 0 ; (i) < (int)(n) ; (i)++)
#define REP(i,a,b) for(int (i) = a ; (int)(i) <= (int)(b) ; (i)++)
#define all(n) (n).begin(),(n).end()
typedef vector<int> Vi;
typedef vector<Vi> VVi;
typedef pair<long long,long long> Pii;
typedef vector<Pii> VPii;


bool done[100][100][1802];
int L[100][100];
int dx[] = {-1,0,1,0};
int dy[] = {0,-1,0,1};

struct NODE{
	int x,y,c,h;
};
bool operator < (const NODE &a,const NODE &b){
	return a.h < b.h;
}

int main(){
	int N,V,Sx,Sy,Gx,Gy;
	cin >> N >> V >> Sx >> Sy >> Gx >> Gy;
	Sx--,Sy--;
	Gx--,Gy--;
	rep(i,N) rep(j,N) cin >> L[i][j];
	
	priority_queue<NODE> Q;
	Q.push({Sx,Sy,0,V});
	unsigned int ans = -1;
	while( Q.size() ){
		auto q = Q.top(); Q.pop();
		if( q.h <= 0 ) continue;
		if( q.c > 1800 ) continue;
		if( done[q.y][q.x][q.c] ) continue;
		else done[q.y][q.x][q.c] = true;
		if( q.y == Gy && q.x == Gx ){
			ans = min(ans,(unsigned)q.c);
			continue;
		}
		for(int i = 0 ; i < 4 ; i++){
			int tx = q.x + dx[i];
			int ty = q.y + dy[i];
			if( tx < 0 || ty < 0 || ty >= N || tx >= N ) continue;
			Q.push({tx,ty,q.c+1,q.h-L[ty][tx]});
		}
	}
	cout << (int) ans << endl;
	
}