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#include <fstream>
#include <algorithm>
using namespace std;
ifstream in("cmlsc.in");
ofstream out("cmlsc.out");
int n,m,a[1025],b[1025],s[1025][1025];
int main()
{
in>>n>>m;
for(int i=1;i<=n;i++)
in>>a[i];
for(int j=1;j<=m;j++)
in>>b[j];
for(int i=1;i<=n;i++)
for(int j=1;j<=m;j++)
if(a[i]==b[j])
s[i][j]=s[i-1][j-1]+1;
else
s[i][j]=max(s[i-1][j],s[i][j-1]);
out << s[n][m] << '\n';
// out << s[n][m] << ' ' << s[n][m];
out.close();
return 0;
}