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#include <fstream>
using namespace std;
ifstream fin("cmlsc.in");
ofstream fout("cmlsc.out");
int i, n, m, j, U[1050][1050];
int H[1050], V[1050];
int main()
{
fin>>n>>m;
for (i=1; i<=n; i++)
fin>>H[i];
for (i=1; i<=m; i++)
fin>>V[i];
for (i=1; i<=m; i++)
{
for (j=1; j<=n; j++)
{
if (V[i]==H[j])
U[i][j]=U[i-1][j-1]+1;
else
U[i][j]=max(U[i-1][j], U[i][j-1]);
}
}
fout<<U[m][n];
return 0;
}