import java.util.*;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        long p = sc.nextInt();
        long q = sc.nextInt();
        int a = sc.nextInt();
        int left = 0;
        int right = 1000000001;
        while (right - left > 1) {
            int m = (left + right) / 2;
            if ((100 + p) * m / 100 >= (100 + q) * m / 100 + a) {
                right = m;
            } else {
                left = m;
            }
        }
        System.out.println(left);
    }
}