P, Q, A = gets.split.map(&:to_i)

def f(x)
  (x + Rational(P * x, 100).floor) < (x + Rational(Q * x, 100).floor) + A
end

if f(1)
  ok = 1
  ng = 10 ** 9 + 1

  while (ok - ng).abs >= 2
    x = (ok + ng) / 2

    if f(x)
      ok = x
    else
      ng = x
    end
  end

  ans = ok
  (ok + 1).upto([ok + 100_000, 10 ** 9].min) do |x|
    ans += 1 if f(x)
  end

  puts ans
else
  puts 0
end