#include<iostream>
#include<cmath>
using namespace std;
class Projectile
{
    private:
    float velocity;
    float angle;
    public:
    Projectile(float v,float a)
    {
        velocity=v;
        angle=a;
    }
    void computeHeight()
    {
        if(velocity<0||angle>90)
        {
            cout<<"Invalid input";
            return;
        }
        const float g=9.81;
        float rad=angle*M_PI/180.0;
        float height=(velocity*velocity*pow(sin(rad),2))/(2*g);
        cout.setf(ios::fixed);
        cout.precision(2);
        cout>>height;
        
    }
};
int main()
{
    float v,a;
    cin>>v>>a;
    Projectile p(v,a);
    p.computeHeight();
    return 0;
}