import java.util.Scanner;

/*
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 */
/**
 *
 * @author Esc
 */
public class lentorata {

    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);

        System.out.println("Lähtönopeus");
        double v = Double.parseDouble(sc.nextLine());

        System.out.println("Lähtökulma");
        double a = Double.parseDouble(sc.nextLine());

        //double x = t * v * Math.cos(a);
        double g = 9.81;

        //double y = -((g * t * t)/2) + t * v * Math.sin(a);
        double t = ((g / 2) / Math.sin(Math.toRadians(a))) / v;


        double ttrue = t / (t * t);
        System.out.println(ttrue);

    }

}