Six secondary students from Hong Kong are taking part in the 51st International Mathematical Olympiad, which is being held in Astana, the capital of Kazakhstan. Derek Ching and Gary Tam of Queen's College, Brian Chung and Trevor Yu of La Salle College, John Yip of Ying Wa College and Kenneth Hung of Diocesan Boys' School have high hopes of winning medals. Participating in the Olympiad is a great honour for the students - it's the ultimate recognition of their ability in maths. Competitors have to answer six questions, each worth seven marks. They get a total of nine hours, over two days, to complete the paper. Last year's Olympiad was held in Bremen, Germany, where Team HK claimed one gold, two silver and two bronze medals. Trevor, Gary and John's efforts were particularly impressive, as they had to fit training in around their revision for their public exams. Team leader Dr Lau Yuk-kam and deputy leader C. J. Lam have great expectations of the team. 'We are all here because of our passion for mathematics, and we will strive to uphold the standard of excellence that Hong Kong has shown throughout the years,' said Brian. Teams from 98 countries or regions are competing in the Olympiad, which ends next Wednesday.