open Scanf
open Printf

let () =
  let p, q, a = scanf "%d %d %d" (fun x y z -> x, y, z) in
  let ans = ref 0 in
  for i = 1 to 10000000 do
    if (p + 100) * i / 100 < (q + 100) * i / 100 + a then
      incr ans
  done;
  if (p + 100) * 1000000000 / 100 < (q + 100) * 1000000000 / 100 + a then
    ans := !ans + (1000000000 - 10000000);
  printf "%d\n" !ans