import java.io.IOException;
import java.util.HashMap;
import java.util.Map;
import java.util.Scanner;

public class Main5 {
	
	public static void main(String args[]) throws IOException {
		Scanner in = new Scanner(System.in);
		int n = in.nextInt();
		int x = in.nextInt();
		int y = in.nextInt();
		
		double k = (double)(n*y)/100;
		
		double needed = k - x;
		
		System.out.println((int)Math.ceil(needed));
		
		in.close();
	}
		
}
		   	  	  			  	        	