import java.util.*;
import java.io.*;
import java.awt.Point;
import static java.lang.Math.*;

public class P168A { 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();
        double need = n*y/100.0-x;
        System.out.println((int)Math.ceil(need));
    }
}
