#include "bits/stdc++.h"
#define int long long
#define all(v) v.begin() , v.end()
#define sz(a) (int)a.size()
using namespace std;
const int INF = 1e18;
void _(){
int n;
cin >> n;
vector<array<int,2>> v(n);
for(int i=0;i<n;i++) cin >> v[i][0];
for(int i=0;i<n;i++) cin >> v[i][1];
sort(all(v),[&](array<int,2> a,array<int,2> b){
return a[0] + a[1] < b[0] + b[1];
});
vector<vector<int>> dp(n+5,vector<int>(n+5,INF));
dp[0][0] = 0;
for(int i=1;i<=n;i++){
for(int j=0;j<n;j++){
if(dp[i - 1][j] == INF) continue;
if(dp[i-1][j] <= v[i - 1][1]){
dp[i][j+1] = min(dp[i][j+1],dp[i-1][j]+v[i-1][0]);
}
dp[i][j] = min(dp[i][j], dp[i-1][j]);
}
}
for(int i=n;i>=0;i--){
if(dp[n][i] != INF){
cout << i << '\n';
return;
}
}
}
int32_t main(){
cin.tie(0); ios::sync_with_stdio(0);
int tc=1;//cin >> tc;
while(tc--) _();
return 0;
}
