#include<bits/stdc++.h>
#define int long long
using namespace std;
unsigned int n,s,l,h[200005],a[200005];
bool check(unsigned int x){
	unsigned int ret=0;
	for(unsigned int i=1;i<=n;i++){
		unsigned int t=h[i]+a[i]*x;
		if(t>l){
			ret+=t;
		}
		if(ret>=s){
			return 1;
		}
	}
	return 0;
}
int f(unsigned int l,unsigned int r){
	if(l>=r){
		return l;
	}
	unsigned int mid=(l+r)/2;
	if(check(mid)==1){
		f(l,mid);
	}else{
		f(mid+1,r);
	}
}
signed main(){
	ios::sync_with_stdio(0);
	cin.tie(0);
	cout.tie(0);
	cin>>n>>s>>l;
	for(unsigned int i=1;i<=n;i++){
		cin>>h[i];
	}
	for(unsigned int i=1;i<=n;i++){
		cin>>a[i];
	}
	cout<<f(0,max(s,l));
	return 0;
}

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