#include <iostream>
#include <cmath>
#include <iomanip>
using namespace std;
 
int main() {
    double sudut, kecepatan;
    cin >> sudut >> kecepatan;
 
    const double g = 9.8; // percepatan gravitasi
    double rad = sudut * M_PI / 180.0; // ubah derajat ke radian
    double waktu = (2 * kecepatan * sin(rad)) / g;
 
    cout << fixed << setprecision(3) << waktu << endl;
 
    return 0;
}
 
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