import java.util.Scanner;
public class Main {

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);

        int radius = sc.nextInt();
        int c = sc.nextInt();

        int diameterAvHelaPizzan = (radius*2);

        int kantenAvPizzan = (diameterAvHelaPizzan-c);

        int resultat =(kantenAvPizzan/diameterAvHelaPizzan);

        System.out.println(resultat*100);

        sc.close();
    }
}