#include<iostream>
#include<cstdio>
#include<cctype>
#define gys mylove
using namespace std;
int n,m,cnt,ans=0;
int ni[1001],mi[1001],dp[1001][1001];
inline void in(int &x)
{
    x=0;int f=1;char t=getchar();
    while(!isdigit(t)){if(t=='-')f=-1;t=getchar();}
    while(isdigit(t)){x=x*10+t-48;t=getchar();}
    x*=f;
}
inline void input(){
	in(n);
	for(int i=1;i<=n;i++) in(ni[i]);
	in(m);
	for(int i=1;i<=m;i++) in(mi[i]);
}
inline void work(){
	for(int i=1;i<=n;i++)
	 for(int j=1;j<=m;j++){
	 	if(ni[i]==mi[j]){
	 		cnt=0;
	 		for(int k=1;k<j;k++) if(mi[k]<mi[j]) cnt=max(cnt,dp[i-1][k]);
	 		dp[i][j]=cnt+1;
	 		ans=max(ans,dp[i][j]);
		 }
		else dp[i][j]=dp[i-1][j];
	 }
	 printf("%d",ans);
}
int Main(){
	freopen("lcis.in","r",stdin);
	freopen("lcis.out","w",stdout);
	input();
	work();
	return 0;
}
int main(){;}
int gys=Main();