#include<cstdio>
#include<cstring>
#include<algorithm>
#include<cstdlib>
using namespace std;
int n,m,a[1010],b[1010],f[1010][1010]={{0}},temp,ans=0; 
int main(){
	freopen("lcis.in","r",stdin);
	freopen("lcis.out","w",stdout);
	scanf("%d",&n);
	for(int i=1;i<=n;i++)scanf("%d",&a[i]);
	scanf("%d",&m);
	for(int j=1;j<=m;j++)scanf("%d",&b[j]);
	for(int i=1;i<=n;i++)for(int j=1;j<=m;j++){
		if(a[i]==b[j]){
			temp=0;
			for(int k=1;k<j;k++)if(b[k]<b[j]&&f[i-1][k]>temp)temp=f[i-1][k];
			if((f[i][j]=temp+1)>ans)ans=f[i][j];
		}
		else f[i][j]=f[i-1][j];
	}
	printf("%d",ans);
	return 0;
}