        import java.util.Scanner;
        public class Codeforce {
        public static void main(String[]args){
            Scanner s=new Scanner(System.in);
            int n=s.nextInt();
            int x=s.nextInt();
            float y=s.nextInt();
           int u=(int) Math.ceil(((y/100)*n));
           if(u>=x)
           System.out.print(u-x);
           else
               System.out.print(0);   
        }
        }
