import java.util.*;
public class WizardsandDemonstration{
	public static void main(String[]args){
		Scanner in=new Scanner(System.in);
		int n=in.nextInt();
		int x=in.nextInt();
		int y=in.nextInt();
		double a=(n*(y/100.0)-x);
		if (a%1>0)
			a++;
		System.out.print(a);		
	}
}
		     						 	   		 			 		  	