#include <iostream>
#include <iomanip>
#include <cmath> // untuk sin, cos, dll
using namespace std;
int main() {
int S; // sudut
double V; // kecepatan awal
const double g = 10.0;
// Input
cin >> S;
cin >> V;
// Konversi derajat ke radian
double rad = S * M_PI / 180.0;
// Komponen kecepatan vertikal
double Vy = V * sin(rad);
// Hitung waktu total
double waktu = (2 * Vy) / g;
// Output dengan 3 angka di belakang koma
cout << fixed << setprecision(3) << waktu << endl;
return 0;
}
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