#include <iostream>
#include <cmath>
#include <iomanip>
using namespace std;
int main() {
int S; // sudut peluncuran (derajat)
double V; // kecepatan awal (m/s)
double g = 10; // gravitasi (m/s^2)
double waktu; // waktu tempuh total (detik)
// Input
cin >> S >> V;
// Konversi sudut ke radian
double rad = S * M_PI / 180.0;
// Hitung waktu total
waktu = (2 * V * sin(rad)) / g;
// Tampilkan hasil (3 angka di belakang koma)
cout << fixed << setprecision(3) << waktu << endl;
return 0;
}
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