#include <bits/stdc++.h>
using namespace std;
int main()
{
double a,b,c;
double S,A,R;
while(cin>>a>>b>>c)
{
S=(a+b+c)/2;
if(S==0)
{
printf("The radius of the round table is: 0.000\n");
}
else
{
A=S*(S-a)*(S-b)*(S-c);
R=sqrt(A)/S;
printf("The radius of the round table is: %.3lf\n",R);
}
}
return 0;
}
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