#include <bits/stdc++.h>
using namespace std;
int main() {
double S_deg, V;
if (!(cin >> S_deg >> V)) return 0; // baca sudut (derajat) dan kecepatan
const double g = 10.0;
double S_rad = S_deg * M_PI / 180.0; // konversi ke radian
double R = (V * V * sin(2.0 * S_rad)) / g;
cout.setf(std::ios::fixed);
cout << setprecision(2) << R << endl; // keluaran 2 desimal
return 0;
}
I2luY2x1ZGUgPGJpdHMvc3RkYysrLmg+CnVzaW5nIG5hbWVzcGFjZSBzdGQ7CgppbnQgbWFpbigpIHsKICAgIGRvdWJsZSBTX2RlZywgVjsKICAgIGlmICghKGNpbiA+PiBTX2RlZyA+PiBWKSkgcmV0dXJuIDA7IC8vIGJhY2Egc3VkdXQgKGRlcmFqYXQpIGRhbiBrZWNlcGF0YW4KICAgIGNvbnN0IGRvdWJsZSBnID0gMTAuMDsKICAgIGRvdWJsZSBTX3JhZCA9IFNfZGVnICogTV9QSSAvIDE4MC4wOyAgICAgIC8vIGtvbnZlcnNpIGtlIHJhZGlhbgogICAgZG91YmxlIFIgPSAoViAqIFYgKiBzaW4oMi4wICogU19yYWQpKSAvIGc7CiAgICBjb3V0LnNldGYoc3RkOjppb3M6OmZpeGVkKTsgCiAgICBjb3V0IDw8IHNldHByZWNpc2lvbigyKSA8PCBSIDw8IGVuZGw7ICAgICAvLyBrZWx1YXJhbiAyIGRlc2ltYWwKICAgIHJldHVybiAwOwp9