#include <algorithm>
#include <iostream>
long long xis[500005];
long long lis[500005];
int permu[11];
using namespace std;
int main()
{
int n;
cin >> n;
for (int i=1; i<=n; i++)
{
cin >> xis[i];
}
for (int i=1; i<=n; i++)
{
cin >> lis[i];
}
if (n<=10)
{
//code the brute force
int nfactorial=1;
for (int i=2; i<=n; i++)
nfactorial*=i;
for (int i=1; i<=n; i++)
permu[i]=i;
int maxbadges=0;
for (int i=1; i<=nfactorial; i++)
{
//check how far it goes
int badgec=1;
long long level=xis[permu[1]];
while (badgec<n and level<=lis[permu[badgec+1]])
{
level+=xis[permu[badgec+1]];
badgec++;
}
maxbadges=max(maxbadges, badgec);
//code the next permutation
int swapa=n-1;
while (permu[swapa]>permu[swapa+1])
swapa--;
int swapb=swapa+1;
for (int j=swapa+2; j<=n; j++)
{
if (permu[j]>permu[swapa])
swapb=j;
}
int x=permu[swapa];
permu[swapa]=permu[swapb];
permu[swapb]=x;
sort(permu+swapa+1, permu+n+1);
}
cout << maxbadges << '\n';
}
else
{
cout << "IDK";
//assume all lis are equal
//do later
}
}
