#include<iostream>
#include<cmath>
using namespace std;

class Projectile {
    double v , a;
    public:
    Projectile(double v0, double a0): v(v0, a(a0) {}
    void calc() {
        if (v < 0 || a< 0) { cout<<"invalid input"; return;}
    double h=(v*v*pow(sin(*M_PI/180),2))/ (2*9.81);
    cout<<fixed<<serprecision(2)<<h;
    }
};
int main(){
    double v, a;
    cin>> v >>a;
    projectile p(v,a);
    p.calc();
}