#include <iostream>
#include <cmath>
using namespace std;
int main() {
double S, V;
cin >> S >> V;
double g = 10.0;
double rad = S * M_PI / 180.0; // konversi derajat ke radian
double range = (V * V * sin(2 * rad)) / g;
cout << range << endl;
return 0;
}
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