#include<iostream>
#include<algorithm>


using namespace std;

int cost[110][110];
int dp[2][110][110];
int INF = 1000000;
int dir[] = { 0, 1, 0, -1, 0 };
int main(void){
	int N, V, NN, SX, SY, GX, GY;
	cin >> N >> V >> SY >> SX >> GY >> GX;
	NN = N*N;
	for (int i = 0; i < N; i++){
		cost[i][0] = cost[0][i] = cost[i][N + 1] = cost[N + 1][i] = INF;
	}
	for (int i = 0; i < N; i++){
		for (int j = 0; j < N; j++){
			cin >> cost[i + 1][j + 1];
			dp[0][i + 1][j + 1]=dp[1][i + 1][j + 1] = INF;
		}
	}
	dp[0][SX][SY] = 0;

	for (int i = 1; i <= NN; i++){
		for (int x = 1; x <= N; x++){
			for (int y = 1; y <= N; y++){
				for (int j = 0; j < 4; j++){
					dp[i & 1][x + dir[j]][y + dir[j + 1]] = min(dp[i & 1][x + dir[j]][y + dir[j + 1]], dp[(i & 1) ^ 1][x][y] + cost[x + dir[j]][y + dir[j + 1]]);
				}
				dp[i&1][x][y] = min(dp[i&1][x][y], dp[(i & 1) ^ 1][x][y]);
			}
		}
		if (dp[i&1][GX][GY] < V){
			cout << i << endl;
			return 0;
		}
	}
	cout << -1 << endl;
	return 0;

}