#include <bits/stdc++.h>
using namespace std;
using ll = long long;
#define vi vector<long long>
#define all(x) x.begin(), x.end()
#define endl "\n"
#define pr pair<ll, ll>
#define ff first
#define ss second
void solution();
int main(){
ios::sync_with_stdio(false);
cin.tie(nullptr);
solution();
return 0;
}
const int N = 5e5+10;
pr a[N];
void solution() {
ll n; cin >> n;
for (int i = 0; i < n; i++) cin >> a[i].ff;
for (int i = 0; i < n; i++) cin >> a[i].ss;
sort(a, a+n);
ll cnt = 0;
ll x = 0;
for (int i = 0; i < n; i++) {
if (x <= a[i].ss) {
cnt++;
x += a[i].ff;
}
}
cout << cnt << endl;
}
