#include <bits/stdc++.h>
using namespace std;
using ll=long long;
#include <atcoder/modint>
using mint=atcoder::modint1000000007;
int main(){
	cin.tie(nullptr);
	ios::sync_with_stdio(false);
	int n;
	cin>>n;
	vector<ll> a(n),b(n);
	for(int i=0;i<n;i++)cin>>a[i];
	for(int i=0;i<n;i++)cin>>b[i];

	{
		vector<ll> na,nb;
		for(int i=0;i<n;i++){
			if(a[i]!=0){
				na.push_back(a[i]);
				nb.push_back(b[i]);
			}
		}
		a=move(na);b=move(nb);
		n=a.size();
	}
	vector<int> idx(n);
	iota(idx.begin(),idx.end(),0);
	ranges::sort(idx,[&](int i,int j)->bool{
		return a[j]*b[i]<a[i]*b[j];
	});
	ll x=0,y=0;
	for(int i=0;i<n;i++)y+=abs(a[i]);
	for(int i:idx){
		x+=abs(a[i]);
		y-=abs(a[i]);
		if(x>=y){
			cout<<(b[i]/((mint)a[i])).val()<<endl;
			return 0;
		}
	}
}