from collections import deque
n,v,sx,sy,gx,gy=map(int,input().split())
sx-=1;sy-=1;gx-=1;gy-=1
grid=[list(map(int,input().split())) for _ in range(n)]
inf=float('inf')
dst=[[inf]*n for _ in range(n)]
dy=[0,1,0,-1];dx=[1,0,-1,0]
visited=[[[False]*(v+1) for _ in range(n)] for _ in range(n)]
hp=[[0]*n for _ in range(n)]
q=deque()
q.append((0,sy,sx,v))
while q:
    d,y,x,h=q.popleft()
    if (y,x)==(gy,gx):
        print(d)
        exit()
    if visited[y][x][h]:
        continue
    visited[y][x][h]=True
    if hp[y][x]>=h:
        continue
    hp[y][x]=h
    for i in range(4):
        ny,nx=y+dy[i],x+dx[i]
        if 0<=ny<n and 0<=nx<n and h>grid[ny][nx]:
            nh=h-grid[ny][nx]
            if not visited[ny][nx][nh] and hp[ny][nx]<nh:
                q.append((d+1,ny,nx,nh))
print(-1)