// editor2
#include<iostream>
#include<math.h>
#include<iomanip>
using namespace std;
class projectile {
    private:
    float initalvelocity;
    float angle;
    public:
    projectile(floatv, float a){
        initialvelocity=v;
        angle = a;
    }
    void computeheight(){
        float g =9.81;
        if (initialvelocity<0||angle<-90||angle>90){
            cout<<" Invalid input ";
            return ;
        }
        float raians=angle*M_PI/180.0;
        float height = (initialvelocity*initialvelocity*pow(sin(radians),2))/(2*g);
        cout<<fixed<<setprecision(2)<<height;
        
    }
    };
    int main(){
        float v,a;
        cin>>v>>a;
        projectile p(v,a);
        p.computeheight();
        return 0;
    }