#include <iostream>
#include <cmath>
#include <iomanip>
 
int main() {
    double sudut, kecepatan, dummy;
    // Membaca tiga input secara langsung
    std::cin >> sudut >> kecepatan >> dummy;
 
    // Menghitung ketinggian dalam satu baris
    // (2 * Gravitasi) menjadi 20.0
    // PI / 180.0 digunakan untuk konversi ke radian
    double ketinggian = (pow(kecepatan, 2) * pow(sin(sudut * 3.14159265 / 180.0), 2)) / 20.0;
 
    // Mencetak hasil yang sudah diformat
    std::cout << std::fixed << std::setprecision(2) << ketinggian << std::endl;
 
    return 0;
}
 
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