002.cpp

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#include <iostream>
using namespace std;
int
main ()
{

  unsigned a = 1;
  unsigned b = 1;
  unsigned c = a + b;
  unsigned sum = 0;

  while (c <= 4e6)
    {
      if (c % 2 == 0)
        sum += c;
      a = b;
      b = c;
      c = a + b;
    }

  cout << sum << endl;
  return 0;
}