IMO 2014 problem 5


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21. rujna 2014.
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For each positive integer n, the Bank of Cape Town issues coins of denomination \frac{1}{n}. Given a finite collection of such coins (of not necessarily different denominations) with total value at most 99 + \frac{1}{2}, prove that it is possible to split this collection into 100 or fewer groups, such that each group has total value at most 1.
Izvor: International Mathematical Olympiad 2014, day 2