from heapq import heappush, heappop
n, v, sy, sx, gy, gx = map(int, input().split())
sx -= 1
sy -= 1
gx -= 1
gy -= 1
l = [list(map(int, input().split())) for _ in range(n)]
INF = 10 ** 18
dist = [[[INF] * 2000 for _ in range(n)] for _ in range(n)]
dist[sx][sy][0] = 0
q = [(0, sx, sy, 0)]
while q:
    d, x, y, c = heappop(q)
    if d > dist[x][y][c]:
        continue
    for dx, dy in (1, 0), (0, 1), (-1, 0), (0, -1):
        nx, ny = x + dx, y + dy
        if not (0 <= nx < n and 0 <= ny < n):
            continue
        nc = c + l[nx][ny]
        if nc < 2000 and d + 1 < dist[nx][ny][nc]:
            dist[nx][ny][nc] = d + 1
            heappush(q, (d + 1, nx, ny, nc))
ans = min(dist[gx][gy][:v])
if ans == INF:
    ans = -1
print(ans)