import java.util.*;

/**
 *
 * @author greggy
 */
public class WizardsAndDemonstration {

    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        double n = in.nextInt();
        int x = in.nextInt();
        double y = in.nextInt();

        double dolls = (double) (Math.ceil(n * y / 100)) - x;
        int ans = (int) dolls;

        System.out.println(ans);
    }

}