
import java.util.Scanner;

// http://codeforces.com/problemset/problem/168/A
public class WizardsandDemonstration {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Scanner sc = new Scanner(System.in);
		int pop = sc.nextInt();
		int wiz = sc.nextInt();
		int percent = sc.nextInt();
		double temp = (double)(pop/100.0) * percent;
		int req = (int) Math.ceil(temp);
		System.out.println(req - wiz);
	}
	
}
