import sys

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)]

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

main()