#include <stdio.h>

const int Maxn = 100;
const int MaxConsume = 200;

int n, r[Maxn + 1], p[Maxn + 1];

int taskProcess() {
	int cnt = 0, t = 0, tasknum = n;
	while (tasknum) {
		int min = MaxConsume + 1, minIndex;
		for (int i = 1; i <= n; i++)
			if (t >= r[i] && p[i] > 0 && p[i] < min) {
				min = p[i];
				minIndex = i;
			}
		p[minIndex]--;
		t++;
		if (p[minIndex] == 0) {
			cnt += t;
			tasknum--;
		}
	}
	return cnt;
}

int main() {
	scanf("%d", &n);
	for (int i = 1; i <= n; i++)
		scanf("%d", &r[i]);
	for (int i = 1; i <= n; i++)
		scanf("%d", &p[i]);
	printf("%d", taskProcess());
	return 0;
}