#include <iostream>
#include <iomanip>
#include <math>
using namespace std;

class projectile
{
    private:
    double velocity;
    double angledeg;
    
    public:
    projectile(double v, double a) : velocity(v), angledeg(a) {}
    
    double maxheight() const
    {
        const double g =9.81;
        double anglerad=angledeg*M_PI/180.0;
        double s=sin(anglerad);
        return (velocity*velocity*s*s)/(2.0*g);
    }
};

int main()
{
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    
    double v,a
    if(!(cin>>v)||!(cin>>a)||v<0.0||a<0.0)
    {
        cout<<"Invalid input";
        return 0;
    }
    
    projectile p(v,a);
    double h=p.maxheight();
    cout<<fixed<<setprecision(2)<<h;
    return 0;
}