#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; 
}