#include<bits/stdc++.h>
using namespace std;
#define int long long
const int N=2e5+10;
struct nd{int a,b;}c[N];
signed main()
{
	ios::sync_with_stdio(0);
	cin.tie(0);cout.tie(0);
	int n,x,y;cin>>n>>x>>y;
	int ans=n,sum=0,l=0,r=0;
	for(int i=1;i<=n;i++)cin>>c[i].a;
	for(int i=1;i<=n;i++)cin>>c[i].b;
	sort(c+1,c+n+1,[](nd n1,nd n2){return n1.a>n2.a;});
	for(int i=1;i<=n;i++)
	{
		sum++;l+=c[i].a;r+=c[i].b;
		if(l>x||r>y)break;
	}
	ans=min(ans,sum);sum=l=r=0;
	sort(c+1,c+n+1,[](nd n1,nd n2){return n1.b>n2.b;});
	for(int i=1;i<=n;i++)
	{
		sum++;l+=c[i].a;r+=c[i].b;
		if(l>x||r>y)break;
	}
	ans=min(ans,sum);cout<<ans;
	return 0;
}