#!/usr/bin/ python3.8
import sys
read = sys.stdin.buffer.read
readline = sys.stdin.buffer.readline
readlines = sys.stdin.buffer.readlines
from collections import deque

N, V, Sy, Sx, Gy, Gx = map(int, readline().split())
L = tuple(map(int, read().split()))
Sx -= 1
Sy -= 1
Gx -= 1
Gy -= 1
S = Sx * N + Sy
G = Gx * N + Gy

INF = 1000
M = N * N

best_v = [0] * M
start = M * V + S
q = deque([(start, 0)])

answer = INF
while q:
    x, d = q.popleft()
    V, xy = divmod(x, M)
    x, y = divmod(xy, N)
    d += 1
    for dx, dy in ((1, 0), (-1, 0), (0, 1), (0, -1)):
        x1 = x + dx
        y1 = y + dy
        if not ((0 <= x1 < N) and (0 <= y1 < N)):
            continue
        xy1 = x1 * N + y1
        V1 = V - L[xy1]
        if V1 <= 0:
            continue
        if xy1 == G:
            print(d)
            exit()
        v = M * V1 + xy1
        if best_v[xy1] < V1:
            best_v[xy1] = V1
            q.append((v, d))

print(-1)