package main

import . "fmt"
import . "sort"

func main() {
	var n int
	Scan(&n)
	ab := make([][]int, n)
	for i := range ab {
		ab[i] = make([]int, 2)
		Scan(&ab[i][0])
	}
	for i := range ab {
		Scan(&ab[i][1])
	}
	Slice(ab, func(i, j int) bool {
		return ab[i][0] < ab[j][0]
	})
	r := make([]bool, 5e5*2+1)
	r[1] = true
	ans := 1
	for _, vs := range ab {
		if !r[vs[0]] {
			continue
		}
		h := vs[0]+vs[1]
		r[h] = true
		if h > ans {
			ans = h
		}
	}
	Println(ans)
}