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#include <iostream>
#include <fstream>
using namespace std;
ifstream f("cmlsc.in");
ofstream g("cmlsc.out");
int n,m,i,j,x[1500],v[1500],mat[1026][1026],val;
int main()
{
f>>n>>m;
for(i=1;i<=n;i++) f>>v[i];
for(i=1;i<=m;i++) f>>x[i];
for(i=1;i<=n;i++)
{
for(j=1;j<=m;j++)
{
if(v[i]==x[j]) val=1;
else val=0;
mat[i][j]=max(mat[i-1][j-1]+val,max(mat[i][j-1],mat[i-1][j]));
}
}
g<<mat[n][m]<<'\n';
return 0;
}