#include<bits/stdc++.h>
#include<iostream>
using namespace std;
int a[10000001],b[10000001],n,i,j,s1,s2;
int main()
{
	cin>>n;
    for(i=1;i<=n;i++)cin>>a[i];
	for(i=1;i<=n;i++)cin>>b[i];
	for(i=1;i<=n;i++){
	    s1+=a[i];
	    s2+=b[i];
	    if(s1<s2){
	    	cout<<i;
	    	return 0;
        }
	}
}