#include <stl.h>
#include <iostream.h>

int mult (int initial_, int element_)
{
  return initial_ * element_;
}

int main ()
{
  vector <int> v (5);
  for (int i = 0; i < v.size (); i++)
    v[i] = i + 1;
  int prod = accumulate (v.begin (), v.end (), 1, mult);
  cout << "prod = " << prod << endl;
  return 0;
}