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ninoseki/codeforce#122(Div2.A)

Created June 4, 2012 13:02
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codeforce#122(Div2.A)
# codeforce#122(Div2.A)
n, k = gets.chomp.split(" ").map{|e| e.to_i}
0.upto(n) do |i|
if (i * 2 + 5 * (n - i)) >= k and (i * 2 + 3 * (n - i)) <= k
puts i
break
end
end
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