#include<iostream>
#include<iomanip>
#include<cmath>
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();
}