#include<bits/stdc++.h>
#define int long long
#define endl '\n'
#define fi first
#define se second
using namespace std;
const int N=5e3+10;
const int inf=0x3f3f3f3f3f3f3f3f;
int n,m;
int a[N],b[N];
int f[N][N];
signed main()
{
	cin.tie(0);
	cout.tie(0);
	ios::sync_with_stdio(false);
	memset(f,0x3f,sizeof(f));
	cin>>n;
	for(int i=1;i<=n;i++) cin>>a[i];
	cin>>m;
	for(int i=1;i<=m;i++) cin>>b[i];
	f[0][0]=0;
	for(int i=0;i<=n;i++)
	{
		for(int j=0;j<=m;j++)
		{
			if(!i&&!j) continue;
			if(i) f[i][j]=min((a[i]?((f[i-1][j]&1)?f[i-1][j]+2:f[i-1][j]+1):((f[i-1][j]&1)?f[i-1][j]+1:f[i-1][j]+2)),f[i][j]);
			if(j) f[i][j]=min((b[j]?((f[i][j-1]&1)?f[i][j-1]+2:f[i][j-1]+1):((f[i][j-1]&1)?f[i][j-1]+1:f[i][j-1]+2)),f[i][j]);
		}
	}
	cout<<f[n][m]; 
	return 0;
}