import java.util.*

fun main(arr:Array<String>) {
    val count = readLine()!!.toInt()
    var ans = count
    val mikataLevel = readLine()!!.split(" ").map { it.toInt() }
    val teki = readLine()!!.split(" ").map { it.toInt() }
    for(i in mikataLevel.indices) {
        val que = PriorityQueue<Mikata> { o1, o2 -> if(o1.level == o2.level) o1.count.compareTo(o2.count) else o1.level.compareTo(o2.level) }
        mikataLevel.forEach{que.add(Mikata(it, 0))}
        for(j in mikataLevel.indices) {
            val idx = (i+j)%count
            val mikata = que.poll()
            mikata.level += teki[idx]/2
            mikata.count++
            que.add(mikata)
            if(mikata.count > ans) {
                break
            }
        }
        ans = Math.min(ans, que.toList().maxBy { it.count }!!.count)
    }
    println(ans)
}

class Mikata(var level:Int, var count:Int)