028.cpp

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#include <iostream>
using namespace std;

const unsigned length = 1001;
class spiral
{
  unsigned x;
public:
    spiral ()
  {
    x = 1;
  }
  bool end ()
  {
    return (x > length * length + 1);
  }
  void next ()
  {
    static unsigned short count = 1;
    static unsigned term = 2;

    x += term;
    count++;
    if (count == 5)
      {
        term += 2;
        count = 1;
      }
  }
  unsigned value ()
  {
    return x;
  }
};

int
main ()
{

  unsigned sum = 0;
  for (spiral a; !a.end (); a.next ())
  {  sum += a.value ();
  //cout << a.value()<<endl;
  }

  cout << sum << endl;

  return 0;
}