import java.util.*;


public class first {
	static int as[];
	public static void main(String args[]){			
		Scanner in=new Scanner(System.in);
		int n=in.nextInt();
		int x=in.nextInt();
		int y=in.nextInt();
		int s = (int)Math.ceil(n*y/100.0);
		s-=x;
		if(s>=0)
		System.out.println(s);
	}
}
