from typing import List, Tuple

def main():
    rd = input().split()
    n, v = int(rd[0]), int(rd[1])
    sx, sy = int(rd[2]) - 1, int(rd[3]) - 1
    gx, gy = int(rd[4]) - 1, int(rd[5]) - 1
    lij = [list(map(int, input().split())) for _ in range(n)]

    eij: List[List[Tuple[int, int]]] = [[] for _ in range(n * n)]
    for j in range(n):
        for i in range(n):
            p = (j, i)
            for sib in sibPoints:
                np = (p[0] + sib[0], p[1] + sib[1])
                if np[0] >= 0 and np[1] >= 0 and np[0] < n and np[1] < n:
                    eij[p[0] + p[1] * n].append((np[0] + np[1] * n, lij[np[1]][np[0]]))

    s = sx + sy * n
    g = gx + gy * n

    def calc():
        qi = [s]
        dp = [-1] * (n * n)
        dp[s] = 0

        r = 1
        while len(qi) > 0:
            ri = []
            for q in qi:
                for e in eij[q]:
                    nv = dp[q] + e[1]
                    if nv < v and (dp[e[0]] < 0 or dp[e[0]] > nv):
                        if e[0] == g:
                            return r
                        dp[e[0]] = nv
                        ri.append(e[0])
            qi = ri
            r += 1

        return -1

    print(calc())

sibPoints = [(-1, 0), (0, -1), (1, 0), (0, 1)]
if __name__ == '__main__':
  main()