#yuki34

n,v,sx,sy,gx,gy=map(int,raw_input().split())
sx,sy,gx,gy=sx-1,sy-1,gx-1,gy-1
l=[]
for i in xrange(n):
 l.append(map(int,raw_input().split()))
p=[[0]*n for i in xrange(n)]
dxy=((1,0),(0,1),(-1,0),(0,-1))
q=[[sx,sy,v,0]]
while q:
 x,y,v,d=q.pop(0)
 if (x,y)==(gx,gy):
  print d
  break
 if p[y][x]>v:
  continue
 p[y][x]=v
 for dx,dy in dxy:
  nx,ny=x+dx,y+dy
  if 0<=nx<n and 0<=ny<n and v-l[ny][nx]>p[ny][nx]:
   p[ny][nx]=v-l[ny][nx]
   q.append([nx,ny,v-l[ny][nx],d+1])
else:
 print -1