#include <iostream>
#include <cmath>
#include <iomanip> // untuk setprecision
 
using namespace std;
 
int main() {
    double sudut, kecepatan;
    cin >> sudut >> kecepatan;
 
    // konversi sudut ke radian
    double rad = sudut * M_PI / 250;
 
    // rumus waktu = (2 * v * sin(theta)) / g
    double g = 9.8;
    double waktu = (2 * kecepatan * sin(rad)) / g;
 
    cout << fixed << setprecision(3) << waktu << endl;
    return 0;
}
 
				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