/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */
//package Codeforces2;

import java.util.Scanner;

/**
 *
 * @author DELL
 */
public class Wizards_and_Demonstration {
    public static void solve(){
        Scanner nera = new Scanner(System.in);
        int n=nera.nextInt();
        int x=nera.nextInt();
        int y=nera.nextInt();
       
        System.out.println((int)Math.ceil((y*n/100.0))-x);
    }
    public static void main(String[] args) {
        
        solve();
       
    }
}
