/* ==================================================
 * NYU Programming Team Week 5 Problem 1
 * Shikuan Huang
 * http://acm.hust.edu.cn/vjudge/contest/view.action?cid=59294#overview
 * ==================================================
 */

import java.util.*;

public class Main {
	public static void main(String[] args)
	{
		Scanner input = new Scanner(System.in);
		double citizens = input.nextDouble();
		double wizards = input.nextDouble();
		double percentage = input.nextDouble();
		
		double currentPercentage = wizards / citizens * 100;
		double neededPercentage = (percentage - currentPercentage) / 100;
		int clones = (int)Math.ceil(neededPercentage * citizens);
		System.out.println(clones);
		input.close();
	}
}

  	 		 	  		  						  	   		 	