Коледно състезание по математика

[garion]

http://www.ipernik.info/content/%D0%B7%D0%B0-%D0%BF%D1%8A%D1%80%D0%B2%D0%B8-%D0%BF%D1%8A%D1%82-%D0%B2-%D0%BF%D0%B5%D1%80%D0%BD%D0%B8%D0%BA-%D0%BA%D0%BE%D0%BB%D0%B5%D0%B4%D0%BD%D0%BE-%D1%81%D1%8A%D1%81%D1%82%D0%B5%D0%B7%D0%B0%D0%BD%D0%B8%D0%B5-%D0%BF%D0%BE-%D0%BC%D0%B0%D1%82%D0%B5%D0%BC%D0%B0%D1%82%D0%B8%D0%BA%D0%B0
така вече става