Tak z _FIXED_ by zetamatta

$c={}
def f(x,y,z)
$c[[x,y,z]]||=x>y ?f(f(x-5,y,z),f(y-5,z,x),f(z-5,x,y)):z
end
puts f(*split.map{|n|n.to_i})while gets

Note that non-ascii characters in the above source code will be escaped (such as \x9f).

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