#include <bits/stdc++.h>
using namespace std;
#define int long long
#define ll long long
#define rep(i,a,b) for (int i = a; i <= b; i++)
#define per(i,a,b) for (int i = a; i >= b; i--)
#define fi first
#define se second
#define pii pair<int,int>
#define pb push_back
const int MAXN = 5e3+10;
const int INF = 1e18 + 5;
array<int,3> a[MAXN];
int dp[MAXN][MAXN];
int32_t main() {
ios_base::sync_with_stdio(0); cin.tie(nullptr);
int n;cin >> n;
rep(i,1,n) cin >> a[i][1];
rep(i,1,n) cin >> a[i][2];
rep(i,1,n) a[i][0] = a[i][1] + a[i][2];
sort(a+1,a+n+1);
rep(j,1,n) dp[0][j] = INF;
rep(i,1,n) {
rep(j,0,n) {
dp[i][j] = dp[i-1][j];
if (j>0 && dp[i-1][j-1] <= a[i][2]) dp[i][j] = min(dp[i][j], dp[i-1][j-1] + a[i][1]);
}
}
per(j,n,1) {
if (dp[n][j] < INF) {
cout << j << '\n';
break;
}
}
return 0;
}
