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#include <fstream>
using namespace std;
ifstream fin("cmlsc.in");
ofstream fout("cmlsc.out");
int a[1025],b[1025];
int com[1025][1025];
int main() {
int n,m;
fin>>n>>m;
for (int i=1;i<=n;i++) {
fin>>a[i];
}
for (int i=1;i<=m;i++) {
fin>>b[i];
}
for (int i=1;i<=n;i++) {
for (int j=1;j<=m;j++) {
if (a[i]==b[j]) {
com[i][j]=1+com[i-1][j-1];
}else {
com[i][j]=max(com[i][j-1],com[i-1][j]);
}
}
}
fout<<com[n][m]<<"\n0";
return 0;
}