import java.util.*

fun main(arr:Array<String>) {
    val inpt = readLine()!!.trim().split(" ").map { it.toInt() }
    val (n, v) = inpt.take(2)
    val (sx, sy, gx, gy) = inpt.drop(2).map { it - 1 }

    val map = (1..n).map { readLine()!!.split(" ").map { it.toInt() }.toTypedArray() }.toTypedArray()
    val step = map.map { it.map { mutableMapOf<Int, Int>() }.toTypedArray() }.toTypedArray()

    val queue = ArrayDeque<Task>(n*n)
    var min = n * n + 1
    queue.add(Task(sx, sy, v, 0))
    while (queue.isNotEmpty()) {
        val t = queue.pop()
        if(t.vital <= 0) {
            continue
        }
        if(t.step > min) {
            continue
        }
        var skip = false
        step[t.y][t.x][t.vital]?.also {
            if(it <= t.step) {
                skip = true
            }
        }
        if(step[t.y][t.x].filter { it.key >= t.vital && it.value <= t.step }.isNotEmpty()) {
            skip = true
        }
        if(skip) {
            continue
        } else {
            step[t.y][t.x][t.vital] = t.step
        }
        if(t.x == gx && t.y == gy) {
            min = Math.min(min, t.step)
            continue
        }
        if(t.y > 0) {
            queue.add(Task(t.x, t.y - 1, t.vital - map[t.y - 1][t.x], t.step + 1))
        }
        if(t.y < n - 1) {
            queue.add(Task(t.x, t.y + 1, t.vital - map[t.y + 1][t.x], t.step + 1))
        }
        if(t.x > 0) {
            queue.add(Task(t.x - 1, t.y, t.vital - map[t.y][t.x - 1], t.step + 1))
        }
        if(t.x < n - 1) {
            queue.add(Task(t.x + 1, t.y, t.vital - map[t.y][t.x + 1], t.step + 1))
        }
    }
    var ans = -1
    if(step[gy][gx].isNotEmpty()) {
        ans = step[gy][gx].values.min()!!
    }
    println(ans)
}

data class Task(val x:Int, val y:Int, val vital:Int, val step:Int)