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

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