#include<bits/stdc++.h>
using namespace std;
const int N=1e5+20;
long long n,i,a[N],b[N];
vector <pair<long long,int>> v;
int ans,block;
int main()
{
    cin>>n;
    for(i=1;i<=n;i++) cin>>a[i];
    for(i=1;i<=n;i++) cin>>b[i];

    for(i=2;i<=n;i++) a[i]+=a[i-1];
    for(i=2;i<=n;i++) b[i]+=b[i-1];

    for(i=0;i<=n;i++) v.push_back({a[i]-b[i],i});
    sort(v.begin(),v.end());
    for(i=0;i<v.size();i++)
    {
        if(i>0 and v[i].first!=v[i-1].first) block=i;
        ans=max(ans,v[i].second-v[block].second);
    }
    cout<<ans;
}