import java.util.*;
import java.math.*;

public class nyu_101720140 {
	public static void main (String[] args) {
		Scanner scanner = new Scanner(System.in);
		long n = scanner.nextLong();		//city population
		long x = scanner.nextLong();		//number of wizards
		long y = scanner.nextLong();		//percentage over 100
		double percentage = (double)y / 100.0d;
		n = (long)(Math.floor((double)n * percentage)) - x;
		System.out.println(n);
	}
}
		     	 	 		 			  	  	 	     	