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

from = -(-10**9..-1).bsearch{|x|
  (100 + P) * -x / 100 < (100 + Q) * -x / 100 + A
}

to = -(-10**9..-1).bsearch{|x|
  (100 + P) * -x / 100 <= (100 + Q) * -x / 100 + A
}

x = (from..to).count{|x|
  (100 + P) * x / 100 < (100 + Q) * x / 100 + A
}
p from + x - 1