#include<iostream>
#include<cmath>
using namespace std;
class formula
{
    private:
    float v, a;
    public:
    formula()
    {
        cin>>v>>a;
    }
    float compute()
    
        float H=((v*v)*((sin(a)**2))/2*9.81);
        cout<<fixed<<setprecision(2)<<H;
    }
};
int main()
{
    formula f;
    f.compute();
    return 0;
}