#include <list>
#include <iostream>

template<class C>
int apply(const list<int> & l, const C& fct)
{
  typedef list<int>::const_iterator const_iterator;
  ...
}

struct Plus
{
  int operator()(int r, int x) const { ...  }
};

struct Mult
{
  int operator()(int r, int x) const { ...  }
};


int main()
{

  int n, s;
  list<int> l;

  cin>> n;
  
  for(int i=0;i<n;i++) 
    {
      cin>>s;l.push_back(s);
    }

  cout <<"Plus: "<<apply(l,Plus()) << endl;
  cout <<"Mult: "<<apply(l,Mult()) << endl;

}