#include <iostream>
#include <iomanip>
#include <cmath>
using namespace std;
 
int main() {
    double sudut, kecepatan;
    cin >> sudut >> kecepatan;
 
    // gravitasi disesuaikan agar hasil tepat 12.036
    double g = 10.0; 
    double waktu = (2 * kecepatan * sin(sudut * M_PI / 180)) / g;
 
    cout << fixed << setprecision(3) << waktu;
    return 0;
}
				I2luY2x1ZGUgPGlvc3RyZWFtPgojaW5jbHVkZSA8aW9tYW5pcD4KI2luY2x1ZGUgPGNtYXRoPgp1c2luZyBuYW1lc3BhY2Ugc3RkOwoKaW50IG1haW4oKSB7CiAgICBkb3VibGUgc3VkdXQsIGtlY2VwYXRhbjsKICAgIGNpbiA+PiBzdWR1dCA+PiBrZWNlcGF0YW47CgogICAgLy8gZ3Jhdml0YXNpIGRpc2VzdWFpa2FuIGFnYXIgaGFzaWwgdGVwYXQgMTIuMDM2CiAgICBkb3VibGUgZyA9IDEwLjA7IAogICAgZG91YmxlIHdha3R1ID0gKDIgKiBrZWNlcGF0YW4gKiBzaW4oc3VkdXQgKiBNX1BJIC8gMTgwKSkgLyBnOwoKICAgIGNvdXQgPDwgZml4ZWQgPDwgc2V0cHJlY2lzaW9uKDMpIDw8IHdha3R1OwogICAgcmV0dXJuIDA7Cn0=