Challenge

I was sitting comfortably in the wide vast room, my head hurt a bit, left foot, then gently shake, eyes glance look around, there must be sufficient to more than 500 people from the color there. They look a bit tense, eyes look like waiting dam way something. Reng, Reng, Reng ...! Moment has come. I hurry to see immediate paper files, the words to yellow 49th International Mathematics Olympiad dam right in the eye, also left a text phrase under white Madrid Spain July 2008.

Now, it is 9 am; cool air makes me feel comfortable. Today is Day 2 of the examinations. I am working on functions problem 4, the easiest of the Day 2 (examination has 6 problems; three problems for each day: easy, medium and hard, from 9:00 am to 1:30   pm), but to divert the gold in the tired, increasingly powerful way slowly when I dare to think. Moment later, I pull my eyes out of paper, in contrast to, breathe deep for the tired workers to disappear and then go to next. Finally I have also resolved polynomials and write on paper, look lift off, the clock only 10:05 am.

I continue working on combinations problem 5 (a average problem) with the first all tired. I guess that it require a prediction response, and then try some small cases. The results appear in my eye 2 ... 8 ... 15 ... then 32. What is this? Why it does not have any law? I check everything slowly, top heavy with quotes, thoughts about the cord and the neurons in the nervous tension as the only charge, only the hand recounts of paper carefully Left identical numbers as a child are set counting. 2 ... 8 ... 15 ... then 32. Still that! Despite three, four times. My comment is important but what I think, not to add a little something. Not be known, I cover on yellow paper rectangle with two words would imply WC outside.

Jump to sink in, the set of cold water on hand, I lift off straight into my eyes look in the mirror, water streaming on the cheek, slightly frowned. I wonder why today fastening prevent me achieving what I...