#include<iostream>
#include<cmath>
using namespace std;
class projectile{
    private:
    float velocity;
    float angle;
    
    public:
    projectile(float v,float a)
    {
        velocity = a;
        angle = a;
    }
    void c(){
        if (velocity<0||angle<0||velocity>=100||angle>90)
        {
            cout<<"Invalid input";
            return;
        }
        const float g= 9.81;
        float radians = angle*M_PI/180.0;
        float H = (velocity*velocity*pow(sin(radians),2))/(2*g);
        
        cout.self(ios::fixed);
        cout.precision(2);
        cout<<H;
    }
};
int main(){
    float v,a;
    cin>>v>>a;
    
    if (v<0||v>100||a<0||a>90){
        cout<<"Invalid input";
        return 0;
    }
    projectile p(v,a);
    p.c();
    return 0;
}