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 )-x;//the minimum number of clones to create
		System.out.println(output);

	}

}
