//---------------------------------------------------------------------------

#pragma hdrstop

//---------------------------------------------------------------------------

#pragma argsused
#include <iostream.h>
int main(int argc, char* argv[])
{
  int m,n,s,x,i,j,a[20010],p[20010];
  cin>>n>>m;
  while (n+m)
  {
    cin>>a[0];
    s=1;
    for (i=0;i<m;i++)
      p[i]=0;
    for (i=1;i<m;i++)
    {
      cin>>x;
      for (j=0;j<s;j++)
        if (x==a[j])
        { p[j]=1; break; }
      if (s==j) a[s++]=x;
    }
    x=0;
    for (i=0;i<s;i++)
      x+=p[i];

    cout<<x<<endl;

    cin>>n>>m;
  }
  return 0;
}
//---------------------------------------------------------------------------