#include<cstring>
#include<iostream>
#define int long long
using namespace std;
const int N=5e3+5,INF=1e9;
int n,m,f[N][N][2],a[N],b[N];
signed main(){
	ios::sync_with_stdio(0);cin.tie(0);cout.tie(0);
	cin>>n;
	memset(f,0x3f,sizeof f);
	for(int i=1,tot=1;i<=n;i++,tot++){
		cin>>a[i];
		tot+=(a[i]!=tot%2),f[i][0][a[i]]=tot;
	}
	cin>>m;
	for(int i=1,tot=1;i<=m;i++,tot++){
		cin>>b[i];
		tot+=(b[i]!=tot%2),f[0][i][b[i]]=tot;
	}
	for(int i=1;i<=n;i++){
		for(int j=1;j<=m;j++){
			f[i][j][a[i]]=min(f[i][j][a[i]],min(f[i-1][j][0]+(a[i]==0),f[i-1][j][1]+(a[i]==1))+1);
			f[i][j][b[j]]=min(f[i][j][b[j]],min(f[i][j-1][0]+(b[j]==0),f[i][j-1][1]+(b[j]==1))+1);
		}
	}
	cout<<min(f[n][m][a[n]],f[n][m][b[m]]);
	return 0;
}