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#include <iostream>
#include <fstream>
using namespace std;
int n,m,i,o,d[1025][1025],a[1025],b[1025];
int main()
{
ifstream fin ("cmlsc.in");
ofstream fout ("cmlsc.out");
fin>>n>>m;
for(i=1;i<=n;i++)fin>>a[i];
for(i=1;i<=m;i++)fin>>b[i];
for(i=1;i<=n;i++)
{
for(o=1;o<=m;o++)
{
if(a[i]==b[o])d[i][o]=d[i-1][o-1]+1;
else d[i][o]=max(d[i-1][o],d[i][o-1]);
}
}
fout<<d[n][m];
return 0;
}