import sys
import io, os
input = io.BytesIO(os.read(0,os.fstat(0).st_size)).readline

n, v, sx, sy, gx, gy = map(int, input().split())
sx, sy = sx-1, sy-1
gx, gy = gx-1, gy-1
L = []
for i in range(n):
    l = list(map(int, input().split()))
    L += l
s = sy*n+sx
g = gy*n+gx
import heapq
hq = [(0, v, s)]
HP = [0]*(n*n)
heapq.heapify(hq)
visit = [False]*(n*n)
while hq:
    time, hp, i = heapq.heappop(hq)
    y, x = divmod(i, n)
    if i == g:
        print(time)
        exit()
    for dy, dx in (-1, 0), (1, 0), (0, 1), (0, -1):
        ny, nx = y+dy, x+dx
        if 0 <= ny < n and 0 <= nx < n:
            j = ny*n+nx
            if hp-L[j] <= 0:
                continue
            if hp-L[j] > HP[j]:
                HP[j] = hp-L[j]
                heapq.heappush(hq, (time+1, hp-L[j], j))
print(-1)