import sys
readline=sys.stdin.readline
from collections import deque

N,V,Sy,Sx,Gy,Gx=map(int,readline().split())
Sx-=1;Sy-=1;Gx-=1;Gy-=1
L=[list(map(int,readline().split())) for x in range(N)]
queue=deque([(0,0,Sx,Sy)])
inf=1<<60
dist=[[[inf]*N for x in range(N)] for v in range(18*N)]
dist[0][Sx][Sy]=0
while queue:
    d,v,x,y=queue.popleft()
    if dist[v][x][y]<d:
        continue
    for dx,dy in ((0,1),(1,0),(0,-1),(-1,0)):
        xx=x+dx
        yy=y+dy
        if 0<=xx<N and 0<=yy<N:
            vv=v+L[xx][yy]
            if vv<18*N and dist[vv][xx][yy]>d+1:
                dist[vv][xx][yy]=d+1
                queue.append((d+1,vv,xx,yy))
ans=inf
for v in range(18*N):
    if v<V:
        ans=min(ans,dist[v][Gx][Gy])
if ans==inf:
    ans=-1
print(ans)