#include <stdio.h>

typedef struct Edge {
	struct Edge *next;
	int v;
} edge;

void chmax(int *a, int b)
{
	if (*a < b) *a = b;
}

int main()
{
	int i, N, A[2001], B[2001];
	scanf("%d", &N);
	for (i = 1; i <= N; i++) scanf("%d", &(A[i]));
	for (i = 1; i <= N; i++) scanf("%d", &(B[i]));
	
	int u, w;
	edge *adj[1000001] = {}, e[2001], *p;
	for (i = 1; i <= N; i++) {
		u = A[i];
		w = B[i];
		e[i].v = u + w;
		e[i].next = adj[u];
		adj[u] = &(e[i]);
	}
	
	int flag[1000001] = {}, q[2001], head, tail, ans = 0;
	flag[1] = 1;
	q[0] = 1;
	for (head = 0, tail = 1; head < tail; head++) {
		u = q[head];
		chmax(&ans, u);
		for (p = adj[u]; p != NULL; p = p->next) {
			w = p->v;
			if (flag[w] == 0) {
				flag[w] = 1;
				q[tail++] = w;
			}
		}
	}
	printf("%d\n", ans);
	fflush(stdout);
	return 0;
}