#include <bits/stdc++.h>
using namespace std;
#define all(x) x.begin(), x.end()
#define int long long
signed main(){
ios_base::sync_with_stdio(0);
cin.tie(nullptr); cout.tie(nullptr);
int n;
cin >> n;
vector<pair<int, int>> v(n);
for(auto &it : v){
cin >> it.first;
}
for(auto &it : v){
cin >> it.second;
}
sort(all(v), [&](pair<int, int> p1, pair<int, int> p2){
return p1.first + p1.second < p2.first + p2.second;
});
priority_queue<int> pq;
int lv = 0;
for(auto [X, L] : v){
if(lv <= L){
lv += X; pq.push(X);
}else if(pq.top() > X){
lv -= pq.top() - X;
pq.push(X);
pq.pop();
}
}
cout << (int) pq.size() << "\n";
return 0;
}
