import sys
from heapq import *

sys.setrecursionlimit(10 ** 6)
int1 = lambda x: int(x) - 1
p2D = lambda x: print(*x, sep="\n")
def II(): return int(sys.stdin.readline())
def MI(): return map(int, sys.stdin.readline().split())
def LI(): return list(map(int, sys.stdin.readline().split()))
def LLI(rows_number): return [LI() for _ in range(rows_number)]
dij = [(0, 1), (1, 0), (0, -1), (-1, 0)]

def main():
    n,v,sj,si,gj,gi=MI()
    sj, si, gj, gi=sj-1,si-1,gj-1,gi-1
    ll=LLI(n)
    maxhp=[[0]*n for _ in range(n)]
    bfs=[]
    #[距離,体力,行,列]
    heappush(bfs,[0,v,si,sj])
    while bfs:
        dist,hp,i,j=heappop(bfs)
        maxhp[i][j]=hp
        for di,dj in dij:
            ni,nj=i+di,j+dj
            if ni<0 or nj<0 or ni>=n or nj>=n:continue
            nhp=hp-ll[ni][nj]
            if nhp<=maxhp[ni][nj]:continue
            if (ni, nj) == (gi, gj):
                print(dist+1)
                exit()
            heappush(bfs,[dist+1,nhp,ni,nj])
    print(-1)

main()