#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 computeMaxHeight(){
        if(velocity<0||angle<0) {
            cout<<"Invalid input";
            return;
        }
        
        const double g = 9.81;
        const double PI = 3.141592653589793;
        
        
        double radians = angle * PI/180.0;
        double height = (velocity* velocity* pow(sin(radians),2))/(2*g);
        cout<<fixed<<setprecision(2)<<height;
    }
};
int main(){
    double v,a;
    cin>>v>>a;
    Projectile p(v,a);
    p.computeMaxHeight();
    
    return 0;
}