import sys
read=sys.stdin.buffer.read
readline=sys.stdin.buffer.readline
readlines=sys.stdin.buffer.readlines

n, v, sx, sy, gx, gy=map(int, readline().split())
l=list(map(int, read().split()))
sx-=1
sy-=1
gx-=1
gy-=1
INF=10**5
d=[INF]*(n*n*v)
d[sy*n+sx]=0
from collections import deque
que=deque()
que.append(sy*n+sx)
while que:
    hxy=que.popleft()
    h, xy=divmod(hxy, n*n)
    x, y=divmod(xy, n)
    for dx, dy in ((1, 0), (-1, 0), (0, 1), (0, -1)):
        x1, y1=x+dx, y+dy
        if x1<0 or x1>=n or y1<0 or y1>=n:
            continue
        xy1=x1*n+y1
        h1=l[xy1]+h
        if h1>=v:
            continue
        hxy1=h1*n*n+xy1
        if d[hxy1]>d[hxy]+1:
            d[hxy1]=d[hxy]+1
            if x1==gy and y1==gx:
                print(d[hxy1])
                exit()
            que.append(hxy1)
print(-1)