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);
		}
	}
}