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

    class projectile
    {
        private:
        double velocity;
        double angle;
        public:
        projectile(double v,double a){
            velocity=v;
            angle=a;
        }
        void calculateMaxHeight()
        {
            if(velocity<0||angle<0)
            {
                cout<<"Invalid input"<<endl;
                return;
            }
            else if(-100<v<=100||-90<a<=90)
            const double g=9.81;
            double angleRad=angle*M_PI/180.0;
            double MaxHeight=(pow(velocity,2)*pow(sin(angleRad),2))/(2*g);
            cout<<fixed<<setprecision(2)<<MaxHeight<<endl;
        }
    };
int main()
{
    double v,a;
    cin>>v>>a;
    projectile p(v,a);
    p.calculateMaxHeight();
    return 0;
}