~cpp
#include <iostream>
#include <cmath>
using namespace std;

double a, b, c, halfSum;

void getRadius()
{
	halfSum = (a+b+c)/2.0;
	if(halfSum==0)
	{
		cout << "The radius of the round table is: 0.000"<<endl;
		return;
	}
	cout << "The radius of the round table is: " << 1.0*sqrt(halfSum*(halfSum-a)*(halfSum-b)*(halfSum-c))/halfSum << endl;
}

int main()
{
	cout.setf(ios::fixed, ios::floatfield);  
    cout.setf(ios::showpoint);  
    cout.precision(3);

	while(cin>>a>>b>>c)
		getRadius();
	return 0;
}