P, Q, A = gets.split.map(&:to_i)
M = 10 ** 9

r = 100 * (A + 1)
ans = 0

1.upto(r) do |x|
  if x * P / 100 < x * Q / 100 + A
    ans += 1
  end
end

if P < Q || (P == Q && A > 0)
  ans += M - r
end

puts ans