#include<iostream>
#include<iomanip>
using namespace std;
class projectile{
    double v,a;
    public:
    projectile(double v,double a):v(v),a(a){}
    void printMaxHeight(){
        if(v<0||a<0){cout<<"Invalid input\n";return;}
        double g = 9.81 , h = (v*v*pow(sin(a*M_PI/180),2))/(2*g);
        cout<<fixed<<setprecision(2)<<h<<endl;
        }
    };
    int main()
    {
        double v,a;cin>>v>>a;
        projectile(v,a).printMaxHeight();
    }