[Scythian]

"List of countries by medal count at International Mathematical Olympiad"

1. China
2. USA
3. Russia
4. S Korea
5. Hungry 

18. Thailand
22. Singapore
https://en.wikipedia.org/wiki/List_of_co...20Olympiad

[Scythian]

.
It's possible that Singapore students drinking too much recycled waste water at home.

Cut it down, and medal tally will increase