import java.io.BufferedReader;
import java.io.Closeable;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.Arrays;
import java.util.HashSet;
import java.util.LinkedList;
import java.util.Scanner;
import java.util.Set;
import java.util.StringTokenizer;

public class Main {

	public static final int[][] move_dir = {{1, 0}, {-1, 0}, {0, 1}, {0, -1}};
	
	public static void main(String[] args) throws IOException {
		Scanner sc = new Scanner(System.in);
		
		final int N = sc.nextInt();
		final int V = sc.nextInt();
		final int Sx = sc.nextInt() - 1;
		final int Sy = sc.nextInt() - 1;
		final int Gx = sc.nextInt() - 1;
		final int Gy = sc.nextInt() - 1;
		
		int[][] damage = new int[N][N];
		for(int i = 0; i < N; i++){
			for(int j = 0; j < N; j++){
				damage[i][j] = sc.nextInt();
			}
		}
		
		int[][] cur_max_hp = new int[N][N];
		int[][] next_max_hp = new int[N][N];
		
		for(int i = 0; i < N; i++){
			for(int j = 0; j < N; j++){
				cur_max_hp[i][j] = 0;
				next_max_hp[i][j] = 0;
			}
		}
		
		int count = 0;
		cur_max_hp[Sy][Sx] = V;
		while(true){
			for(int i = 0; i < N; i++){
				for(int j = 0; j < N; j++){
					next_max_hp[i][j] = cur_max_hp[i][j];
				}
			}
			
			boolean updated = false;
			
			for(int x = 0; x < N; x++){
				for(int y = 0; y < N; y++){
					for(int[] move : move_dir){
						final int nx = x + move[0];
						final int ny = y + move[1];
					
						if(nx < 0 || nx >= N || ny < 0 || ny >= N){
							continue;
						}
						final int next_hp = cur_max_hp[y][x] - damage[ny][nx];
						
						if(next_hp > next_max_hp[ny][nx]){
							updated = true;
							next_max_hp[ny][nx] = next_hp;
						}
					}
				}
			}
				
			if(next_max_hp[Gy][Gx] > 0){
				System.out.println(count + 1);
				break;
			}else if(!updated){
				System.out.println(-1);
				break;
			}
			
			count++;
			
			int[][] tmp = cur_max_hp;
			cur_max_hp = next_max_hp;
			next_max_hp = tmp;
		}
	}
	
	public static class Scanner implements Closeable {
		private BufferedReader br;
		private StringTokenizer tok;

		public Scanner(InputStream is) throws IOException {
			br = new BufferedReader(new InputStreamReader(is));
		}

		private void getLine() throws IOException {
			while (!hasNext()) {
				tok = new StringTokenizer(br.readLine());
			}
		}

		private boolean hasNext() {
			return tok != null && tok.hasMoreTokens();
		}

		public String next() throws IOException {
			getLine();
			return tok.nextToken();
		}

		public int nextInt() throws IOException {
			return Integer.parseInt(next());
		}

		public long nextLong() throws IOException {
			return Long.parseLong(next());
		}

		public void close() throws IOException {
			br.close();
		}
	}

}