import java.util.*;
import java.math.*;
import java.io.*;
public class LOL {
    public static void main(String[] args) throws Exception {
        Scanner in = new Scanner(System.in);
        int N = in.nextInt();
        int X = in.nextInt();
        int Y = in.nextInt();
        System.out.println(Math.max(0,(N*Y+99)/100)-X);
    }
}