import java.util.*;
public class p168a {
	public static void main(String[] args) {
		Scanner in = new Scanner(System.in);
		int N = in.nextInt();
		int W = in.nextInt();
		int P = in.nextInt();
		
		int res = (int)Math.ceil((P*N-100*W)/100.);
		
		System.out.println(res);
	}
}
