//dominater orz
//evenvalue orz
//roumak orz
//melody orz
//cpp orz
#include <bits/stdc++.h>
using namespace std;
#define int long long
#define pii pair<int, int>
#define ppii pair<pii, pii>
#define tiii tuple<int, int, int>
#define g0 get<0>
#define g1 get<1>
#define g2 get<2>
#define f first
#define s second
#define pb push_back
const int N = 2e5+5;
const int MOD = 1e9+7;
bool comp(pii p, pii q) {
return (p.f+p.s < q.f+q.s);
}
signed main() {
// freopen("in.in", "r", stdin);
ios_base::sync_with_stdio(false);
cin.tie(0);
int n; cin >> n;
vector<pii> a(n);
for (int i = 0; i < n; i++) {
cin >> a[i].s;
}
for (int i = 0; i < n; i++) cin >> a[i].f;
sort(a.begin(), a.end(), comp);
vector<int> ans(n+1, LLONG_MAX);
ans[0] = 0;
for (int i = 0; i < n; i++) {
int j = upper_bound(ans.begin(), ans.end(), a[i].f)-ans.begin();
ans[j] = min(ans[j], ans[j-1]+a[i].s);
}
for (int i = 0; i <= n; i++) {
if (ans[i] == LLONG_MAX) {
cout << i-1 << '\n';
exit(0);
}
}
cout << n;
}
