#include <bits/stdc++.h>
using namespace std;
const int nmax=100005;
int n,j,i;
long long x,a[nmax],b[nmax];

int main()
{
   cin>>n;
   for (i=1;i<=n;i++)
   {
       cin>>x;
       a[i]=x+a[i-1];
   }
   for (i=1;i<=n;i++)
   {
       cin>>x;
       b[i]=x+b[i-1];
   }

   for (i=n;i>=1;i--)
   {
       for (j=i;j<=n;j++)
        if (a[j]-a[j-i]==b[j]-b[j-i])
         {
             cout<<i;
             return 0;
         }
   }
}