#include <iostream> 
using namespace std; 
 
template <typename T> class Counter { 
public: 
   Counter() { 
       cout << ++x; 
   } 
 
   static int x; 
}; 
 
template <typename T> int Counter<T>::x; 
 
int main() { 
   Counter<int> a; 
   Counter<int> b; 
   Counter<double> c; 
   Counter<Counter<double>> d; 
   return 0; 
}