001.cpp

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#include <iostream>
using namespace std;

int
main ()
{
  unsigned sum = 0;
  for (int k = 1; k < 1000; k++)
    {
      if (k % 3 == 0)
        sum += k;
      else if (k % 5 == 0)
        sum += k;
    }
  cout << sum << endl;
  return 0;
}