import sys

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)]
    now=[[v,si,sj]]
    cnt=1
    while now:
        #print(now)
        nxt=[]
        for hp,i,j in now:
            for ni,nj in [[i+1,j],[i-1,j],[i,j+1],[i,j-1]]:
                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(cnt)
                    exit()
                maxhp[ni][nj]=nhp
                nxt.append([nhp,ni,nj])
        now=nxt
        cnt+=1
    print(-1)

main()