#include<bits/stdc++.h>
using namespace std;
int main()
{
double a,b,c,s;
while(cin>>a>>b>>c)
{
s=.5*(a+b+c);
c=(double)4/3*sqrtl(s*(s-a)*(s-b)*(s-c));
if(c>0.0)
printf("%.3lf\n",c);
else cout<<"-1.000"<<endl;
}
}
using namespace std;
int main()
{
double a,b,c,s;
while(cin>>a>>b>>c)
{
s=.5*(a+b+c);
c=(double)4/3*sqrtl(s*(s-a)*(s-b)*(s-c));
if(c>0.0)
printf("%.3lf\n",c);
else cout<<"-1.000"<<endl;
}
}
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