import java.io.File;
import java.util.Scanner;

public class Codeforce {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
//        Scanner in = new Scanner(new File("d:\\input.txt"));
        float n = in.nextFloat();
        int xy = in.nextInt();
        int yx = in.nextInt();
        System.out.print(((int)Math.ceil(n/100*yx))-xy);
    }
}
