import sys
import heapq

input = sys.stdin.readline


def main():
    N, V, SX, SY, GX, GY = map(int, input().split())
    L = [list(map(int, input().split())) for i in range(N)]

    if V > (abs(SX-GX) + abs(SY-GY)) * 9:
        print(abs(SX-GX) + abs(SY-GY))
        return

    vis = [[[False]*(V+1) for i in range(N)] for i in range(N)]

    Q = [(0, SY-1, SX-1, V)]
    while len(Q) > 0:
        d, r, c, v = heapq.heappop(Q)
        if vis[r][c][v]:
            continue
        if (r, c) == (GY-1, GX-1):
            print(d)
            return
        vis[r][c][v] = True
        for dx, dy in [(-1, 0), (1, 0), (0, -1), (0, 1)]:
            x, y = r+dx, c+dy
            if 0 <= x < N and 0 <= y < N and v > L[x][y]:
                heapq.heappush(Q, (d+1, x, y, v-L[x][y]))

    print(-1)


if __name__ == '__main__':
    main()