#include <bits/stdc++.h>
using namespace std;
 
int main() {
    double S_deg, V;
    if (!(cin >> S_deg >> V)) return 0; // baca sudut (derajat) dan kecepatan
    const double g = 10.0;
    double S_rad = S_deg * M_PI / 180.0;      // konversi ke radian
    double R = (V * V * sin(2.0 * S_rad)) / g;
    cout.setf(std::ios::fixed); 
    cout << setprecision(2) << R << endl;     // keluaran 2 desimal
    return 0;
}
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