#include<bits/stdc++.h>
using namespace std;
#define ff first
#define ss second
#define pb push_back
#define int long long
const int N=3e5+5;
int a[N];
int b[N];
int bit[N];
signed main(){
int n;
cin>>n;
for(int i=1;i<=n;i++)cin>>a[i];
for(int i=1;i<=n;i++)cin>>b[i];
int s=0;
int j=n;
int i=n-1;
while(i>=1 and j>=2){
int x= min (a[i],b[j]);
a[i]-=x;
b[j]-=x;
s+=x;
if(a[i]==0)i--;
if(b[j]==0)j--;
if(i==j)i--;
}
for(int i=1;i<=n;i++){
int x=min(a[i],b[i]);
a[i]-=x;
b[i]-=x;
s-=b[i];
}
cout<<s;
}
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