#include <iostream>
#include <cmath>
#include <iomanip>
int main() {
double v0, sudut;
std::cin >> v0 >> sudut;
double jarak = (v0*v0 * sin(2 * sudut * 3.14159265 / 180.0)) / 10.0;
std::cout << std::fixed << std::setprecision(1) << jarak << std::endl;
return 0;
}
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