import java.util.Scanner;

public class Main {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Scanner in = new Scanner(System.in);
        int n = in.nextInt();// the number of citizens in the city
        int x = in.nextInt();// number of wizards
        float y = in.nextFloat();// the percentage the administration needs
        int output = (int) Math.ceil((y / 100) * n);// the minimum number of
                                                    // clones to create
        if (output < x)
            System.out.println("0");
        else
            System.out.println(output - x);

    }

}
