#include <bits/stdc++.h>
#define ll long long
#define ll1 long long
#define ull unsigned long long
#define dou long double
#define str string
#define vll vector<ll>
#define vi vector<int>
#define pll pair<ll, ll>
#define vpll vector<pll>
#define vbool vector<bool>
#define vstr vector<str>
#define vvll vector<vll>
#define pb push_back
#define pf push_front
//#define endl "\n"
#define fr first
#define se second
// #define sortcmp(a) sort(a.begin(), a.end(), cmp)
#define sort(a) sort(a.begin(), a.end())
#define reverse(a) reverse(a.begin(), a.end())
#define speed ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0)
#define INF 1000000000000000000
#define ordered_set tree<ll, null_type, less_equal<ll>, rb_tree_tag, tree_order_statistics_node_update>
using namespace std;
//using namespace __gnu_pbds;
mt19937 rng(time(0));
ll randll(ll l, ll r){
return uniform_int_distribution<ll>(l, r)(rng);
}
int main(){
speed;
ll n;
cin >> n;
vpll a(n);
vector<pll> b;
for(int i = 0; i < n; i ++){
cin >> a[i].fr;
}
for(int i = 0; i < n; i ++){
cin >> a[i].se;
b.pb({a[i].se+a[i].fr, i});
}
sort(b);
vll dp(n+7, INF);
dp[0] = 0;
multiset<ll> s;
ll sum = 0;
for(int i = 0; i < n; i ++){
ll k = b[i].se;
if(sum <= a[k].se){
sum += a[k].fr;
s.insert(a[k].fr);
}
else if(sum - *--s.end() <= a[k].se){
sum -= *--s.end();
sum += a[k].fr;
s.erase(--s.end());
s.insert(a[k].fr);
}
}
cout << s.size() << endl;
}
