#include<bits/stdc++.h>
using namespace std;
int m,n,s1[3001],s2[3001],tot;
int asd(int a,int b,int cnt)
{
    int l,r=cnt;
    bool flag=true;
    for(int i=b;i<=n;++i)
    {
        if(s2[i]==s1[a])
        {
            flag=false;
            l=i+1;
            r++;
            break;
        }
        if(i==n&&flag==true) return cnt;
    }
    if(b>n)return cnt;
    for(int i=a;i<=m;++i)
        if(s1[i]>s1[a])  r=max(asd(i,l,cnt+1),r);
    return r;
}
int main()
{
    freopen("lcis.in","r",stdin);
    freopen("lcis.out","w",stdout);
    cin>>m;
    for(int i=1;i<=m;++i)
    cin>>s1[i];
    cin>>n;
    for(int i=1;i<=n;++i)
    cin>>s2[i];
    for(int i=1;i<=m;++i)
    tot=max(asd(i,1,0),tot);
    cout<<tot;
    return 0;
}