import java.util.Scanner; public class Main { public static void main(String[] args) throws Exception { Scanner sc = new Scanner(System.in); double p = sc.nextInt(); double q = sc.nextInt(); int a = sc.nextInt(); sc.close(); if (p <= q) { System.out.println(1000000000); } else { int max = (int) (100 * a / (p - q)); int ans = 0; for (int i = max; i > 0; i--) { int x = (int) ((100 + p) * i / 100); int y = (int) ((100 + q) * i / 100); if (x < y + a) { ans++; } } System.out.println(ans); } } }