" Life is not a problem to be solved but a reality to be experienced! "
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#include <cmath>
using namespace std;
const double PI=3.1415;
const double g=9.806;
int main()
{
double Rk, Rz;
cin>>Rk>>Rz;
double wyniki=2*PI*sqrt((pow(Rk, 3))/(g*pow(Rz, 2)));
cout<<wyniki;
return 0;
}