The International Mathematical Olympiad (IMO) is a competition for high school students, which involves the solution of mathematical problems. It is held every year in July in a different country. The IMO is the oldest international Olympiad on a specific subject. The first IMO was held in Romania in 1959 and 7 countries participated – Bulgaria, Czechoslovakia, Hungary, the GDR, Poland, Romania and the USSR. Since then this event has been held every year with the exception of 1980 and the number of countries that participated has gradually increased. Currently around 600 students from more than 100 countries participate in the...