AdvancedNumeric answer
Three heaps of Nim · Part 3 of 3
Two players alternately remove any positive number of stones from one heap. Whoever takes the last stone wins. The heaps start at 3, 4 and 5.
Before play starts you may add a fourth heap of any size so that the first player loses. What size must it be?
Answer with a number. Fractions, powers and expressions like 23/6 or C(52,5) are read correctly in practice.
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