#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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