//  try.cpp

#include <iostream>
using namespace std;

/*
void fun() {

  class X { public: void show() { cout << "\n  show()"; } };
  X x;
  x.show();
}

void main() {

  fun();
}

*/
/*
template <class A, class B, class C> 
C prod(A one, B two) {

  C result = one*two;
  return result;
}
*/
template <class T, class R> T ReturnSum(const T &t, const R &r) {

//  const_cast<T>(r);
  T t1;
  t1 = t+r;
  return t1;
}

void main() {

  double d = ReturnSum(3.5,2);
  cout << d;
}