import java.util.Scanner;
public class  Wizards
{
public static void main(String []args)
{
Scanner  s = new Scanner(System.in);    
int n = s.nextInt();
int x = s.nextInt();
int y = s.nextInt();
int y_percent_n = (int)Math.ceil((float)n * (float)y / 100.0);
 if(x < y_percent_n)
System.out.println(y_percent_n - x);
else
  System.out.println(0);
    }
}