import java.util.Scanner;
//coach <3
//java for ever
public class a2oj {
	
	
    public static void main(String[] args) throws Exception
    {
        Scanner input = new Scanner(System.in);    
        float n=input.nextFloat(),x=input.nextFloat(),y=input.nextFloat();
       if(n*(y/100)>x){
    	   if(n*(y/100)-(int)(n*(y/100))>0)
    		   System.out.print((int)(n*(y/100)-x+1));
    	   else
    		   System.out.print((int)(n*(y/100)-x));
       }  	   
       else
    	  System.out.print(0);
        
        }
    
}