a, b, c = gets.split(" ").map &:to_i
d = Math.sqrt(4*a*a - 12*b)
e1 = (d - 2 * a) / 6
e2 = (-1 * d - 2 * a) / 6
inf = 10**9
[[-1*inf, e2], [e2, e1], [e1, inf]].each_with_index do |ar, idx|
  l = ar[0].to_f.floor
  r = ar[1].to_f.ceil
  while(r-l > 1) do
    mid = (l + r) / 2
    f = ((mid + a) * mid + b) * mid + c
    f *= -1 if idx == 1
    case f <=> 0
    when 0
      puts mid
      break;
    when -1
      l = mid
    else
      r = mid
    end
  end
end