import java.util.Scanner;
public class WizardsandDemonstration {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		 Scanner sc= new Scanner(System.in);
		int n = sc.nextInt();
		int y =sc.nextInt();
		int z= sc.nextInt();
		int puppets=((n*z)/100),fin=0;
		fin=puppets-y;
		System.out.println(fin);

	}

}
