n,v,sy,sx,gy,gx = map(int,input().split())
b = [list(map(int,input().split())) for _ in range(n)]
v = min(v,1800)
INF = 5000
d = [[[INF]*1801 for _ in range(n)] for _ in range(n)]
d[sx-1][sy-1][v] = 0
gx -= 1; gy -= 1
from collections import deque
q = deque([(0,v,sx-1,sy-1)])
while q:
    dv,v,x,y = q.popleft()
    if x==gx and y==gy:
        print(dv)
        exit()
    for nx,ny in [(x+1,y),(x-1,y),(x,y-1),(x,y+1)]:
        if 0 <= nx < n and 0 <= ny < n:
            nv = v - b[nx][ny]
            if nv <= 0: continue
            if dv+1 < d[nx][ny][nv]:
                d[nx][ny][nv] = dv+1
                q.append((dv+1,nv,nx,ny))
print(-1)