#include <iostream>
#include <cmath>
using namespace std;
int main() {
int S; // Sudut peluncuran derajat
double V; // Kecepatan awal
const double g = 10; // Percepatan gravitasi
cin >> S >> V;
double radian = S * M_PI / 180.0;
double waktu = (2 * V * sin(radian)) / g;
cout.precision(3);
cout << fixed << waktu << endl;
return 0;
}
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