#include<bits/stdc++.h> using namespace std; #define pi 3.141592653589793 int main() { double a,b,c; while(scanf("%lf%lf%lf",&a,&b,&c)!=EOF) { if(a+b+c==0) printf("The radius of the round table is: 0.000\n"); else { double s,r; s=(a+b+c)/2; r=(s-a)*(s-b)*(s-c)/s; printf("The radius of the round table is: %.3lf\n",sqrt(r)); } } return 0; }