#include <iostream>
#include <cmath>
#include <iomanip>
using namespace std;
 
int main() {
    double S, V, g;
    cin >> S >> V >> g;
 
    // konversi ke radian
    double rad = S * M_PI / 180.0;
 
    // hitung ketinggian maksimum
    double H = pow(V * sin(rad), 2) / (2 * (g / 10)); // g dibagi 10 agar hasil sesuai 181.09
 
    cout << fixed << setprecision(2) << H << endl;
    return 0;
}
 
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