from collections import deque

n,v,sy,sx,gy,gx = map(int,input().split())
L = [list(map(int,input().split())) for i in range(n)]
sx,sy,gx,gy = sx-1,sy-1,gx-1,gy-1
inf = 10**10
M = min(v,1800)
dp = [[inf]*(n*n) for i in range(M+1)]
dp[M][sx*n+sy] = 0
hlis = [deque() for i in range(M+1)]
hlis[M].append([0,sx*n+sy])
for life in range(M+1)[::-1]:
    h = hlis[life]
    while h:
        d,ind = h.popleft()
        x,y = divmod(ind,n)
        if dp[life][ind] != d:
            continue

        for (i,j) in ((1,0),(-1,0),(0,1),(0,-1)):
            nx = x+i
            ny = y+j
            if 0 <= nx < n and 0 <= ny < n:
                nind = nx*n+ny
                if life > L[nx][ny] and dp[life-L[nx][ny]][nind] > d+1:
                    dp[life-L[nx][ny]][nind] = d+1
                    hlis[life-L[nx][ny]].append([d+1,nind])

ans = inf
for i in range(M+1):
    ans = min(ans,dp[i][gx*n+gy])
if ans == inf:
    ans = -1
print(ans)