package q0xx;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.util.Arrays;
import java.util.InputMismatchException;

public class Q15_2 {
	static InputStream is;
	static PrintWriter out;
	static String INPUT = "";
	
	static void solve()
	{
		int n = ni(), v = ni();
		int sc = ni()-1, sr = ni()-1;
		int tc = ni()-1, tr = ni()-1;
		int[][] a = new int[n][];
		for(int i = 0;i < n;i++){
			a[i] = na(n);
		}
		int lim = 9*(2*n-2);
		v = Math.min(v, lim);
		
		int[][][] dp = new int[v][n][n];
		int I = 99999999;
		for(int i = 0;i < v;i++){
			for(int j = 0;j < n;j++){
				Arrays.fill(dp[i][j], I);
			}
		}
		int[] q = new int[lim*n*n+1];
		int p = 0;
		int o = 0;
		q[p++] = 0<<14|sr<<7|sc;
		dp[0][sr][sc] = 0;
		int[] dr = { 1, 0, -1, 0 };
		int[] dc = { 0, 1, 0, -1 };
		int mind = I;
		while(o < p){
			int cur = q[o++];
			int dmg = cur>>>14, r = cur>>>7&127, c = cur&127;
			if(r == tr && c == tc && dp[dmg][tr][tc] < mind){
				mind = dp[dmg][tr][tc];
			}
			if(dp[dmg][r][c]+1 < mind){
				for(int k = 0;k < 4;k++){
					int nr = r + dr[k], nc = c + dc[k];
					if(nr >= 0 && nr < n && nc >= 0 && nc < n){
						int ndmg = dmg + a[nr][nc];
						if(ndmg < v && dp[ndmg][nr][nc] > dp[dmg][r][c] + 1){
							dp[ndmg][nr][nc] = dp[dmg][r][c] + 1;
							q[p++] = ndmg<<14|nr<<7|nc;
						}
					}
				}
			}
		}
		out.println(mind == I ? -1 : mind);
	}
	
	public static void main(String[] args) throws Exception
	{
		long S = System.currentTimeMillis();
		is = INPUT.isEmpty() ? System.in : new ByteArrayInputStream(INPUT.getBytes());
		out = new PrintWriter(System.out);
		
		solve();
		out.flush();
		long G = System.currentTimeMillis();
		tr(G-S+"ms");
	}
	
	private static byte[] inbuf = new byte[1024];
	static int lenbuf = 0, ptrbuf = 0;
	
	private static int readByte()
	{
		if(lenbuf == -1)throw new InputMismatchException();
		if(ptrbuf >= lenbuf){
			ptrbuf = 0;
			try { lenbuf = is.read(inbuf); } catch (IOException e) { throw new InputMismatchException(); }
			if(lenbuf <= 0)return -1;
		}
		return inbuf[ptrbuf++];
	}
	
	private static int[] na(int n)
	{
		int[] a = new int[n];
		for(int i = 0;i < n;i++)a[i] = ni();
		return a;
	}
	
	private static int ni()
	{
		int num = 0, b;
		boolean minus = false;
		while((b = readByte()) != -1 && !((b >= '0' && b <= '9') || b == '-'));
		if(b == '-'){
			minus = true;
			b = readByte();
		}
		
		while(true){
			if(b >= '0' && b <= '9'){
				num = num * 10 + (b - '0');
			}else{
				return minus ? -num : num;
			}
			b = readByte();
		}
	}
	
	private static void tr(Object... o) { if(INPUT.length() != 0)System.out.println(Arrays.deepToString(o)); }
}