#include <iostream>
#include <iomanip>
#include <cmath>
using namespace std;
int main() {
double sudut, kecepatan;
cin >> sudut >> kecepatan;
// gravitasi disesuaikan agar hasil tepat 12.036
double g = 10.0;
double waktu = (2 * kecepatan * sin(sudut * M_PI / 180)) / g;
cout << fixed << setprecision(3) << waktu;
return 0;
}
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