#include<iostream>
#include<cmath>
#include<iomanip>
class Projectile{
    private:
    double velocity;
    double angle;
    public:
    Projectile(double v,double a){
        velocity=v;
        angle=a;
        
    }
    void computeHeight(){
        const double g=9.81;
        
        if (velocity <0||angle<0){
            cout<<"Invalid input"<<endl;
            return;
        }
        double theta=angle*M_PI/180.0;
        double height=(velocity*velocity*pow(sin(theta),2))/(2*g);
        
        cout<<fixed<<setprecision(2)<<height<<endl;
    }
        
};
int main(){
    double v,a;
    cin>>v>>a;
    Projectile p(v,a);
    p.computeHeight();
    return 0;
}