#include<bits/stdc++.h>
#include<atcoder/modint>
using namespace std;

struct frac{
  using S=long long;
  S a,b;
  void normalize(){
    S g=gcd(a,b);
    if (g==0) a=0,b=1;
    else a/=g,b/=g;
    if (b<0) a=-a,b=-b;
  }
  frac(S x){
    a=x;
    b=1;
  }
  frac(S num,S den){
    a=num;
    b=den;
    normalize();
  }
  frac(){
    a=0;
    b=1;
  }
  
  friend bool operator==(const frac &l,const frac &r){return l.a*r.b==l.b*r.a;}
  friend bool operator<(const frac &l,const frac &r){return frac(l.a*r.b-l.b*r.a).a<0;}
  friend bool operator<=(const frac &l,const frac &r){return !(l>r);}
  friend bool operator>(const frac &l,const frac &r){return frac(l.a*r.b-l.b*r.a).a>0;}
  friend bool operator>=(const frac &l,const frac &r){return !(l<r);}

  frac operator+=(const frac &r){
    frac ret;
    ret.a=(*this).a*r.b+r.a*(*this).b;
    ret.b=(*this).b*r.b;
    ret.normalize();
    (*this)=ret;
    return *this;
  }
  frac operator-=(const frac &r){
    frac ret;
    ret.a=(*this).a*r.b-r.a*(*this).b;
    ret.b=(*this).b*r.b;
    ret.normalize();
    (*this)=ret;
    return *this;
  }
  frac operator*=(const frac &r){
    frac ret;
    ret.a=(*this).a*r.a;
    ret.b=(*this).b*r.b;
    ret.normalize();
    (*this)=ret;
    return *this;
  }
  frac operator/=(const frac &r){
    frac ret;
    ret.a=(*this).a*r.b;
    ret.b=(*this).b*r.a;
    ret.normalize();
    (*this)=ret;
    return *this;
  }
  frac operator+(const frac &r)const{return frac(*this)+=r;}
  frac operator-(const frac &r)const{return frac(*this)-=r;}
  frac operator*(const frac &r)const{return frac(*this)*=r;}
  frac operator/(const frac &r)const{return frac(*this)/=r;}
};

int main(){
  using ll=long long;
  using mint=atcoder::modint1000000007;
  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];
  map<frac,ll> mp;
  ll sum=0;
  for (int i=0;i<n;i++){
    if (a[i]==0) continue;
    if (a[i]<0){
      a[i]*=-1;
      b[i]*=-1;
    }
    sum-=a[i];
    mp[frac(b[i],a[i])]+=a[i];
  }
  frac ans;
  for (auto [p,s]:mp){
    sum+=s*2;
    if (sum>=0){
      ans=p;
      break;
    }
  }
  cout<<(mint(ans.a)/mint(ans.b)).val()<<endl;
}