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