#include "bits/stdc++.h"
#define pb push_back
#define int long long
using namespace std;
const int inf = 1e16;
bool srt(pair<int, int> a, pair<int, int> b){
if(a.first + a.second != b.first + b.second) return (a.first + a.second < b.first + b.second);
else return (a.first < b.first);
}
int32_t main(){
ios_base::sync_with_stdio(false);
cin.tie(0); cout.tie(0);
int n;
cin>>n;
vector<int> x(n), l(n);
vector<pair<int, int> > a(n);
for(int i = 0; i < n; i++){
cin>>x[i];
}
for(int i = 0; i < n; i++){
cin>>l[i];
a[i] = {x[i], l[i]};
}
sort(a.begin(), a.end(), srt);
int ans = 0, cur = 0;
priority_queue<int> pq;
for(int i = 0; i < n; i++){
if(cur <= a[i].second){
ans++;
pq.push(a[i].first);
cur += a[i].first;
}
else{
if(pq.top() > a[i].first){
cur -= pq.top();
pq.pop();
cur += a[i].first;
pq.push(a[i].first);
}
}
}
cout<<ans<<endl;
return 0;
}
