/* package whatever; // don't place package name! */
 
import java.util.*;
import java.lang.*;
import java.io.*;
 
/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
      interface F {
        double f(double a, double b, double c);
      }
      public static void main(String[] args) {
        F f = (a,b,c)->a*b*c/(b+c-a)/(a-b+c)/(a+b-c);
 
        System.out.println(f.f(1,1,1));
        System.out.println(f.f(3,4,5));
        System.out.println(f.f(42,42,3.14));
        System.out.println(f.f(14,6,12));
        System.out.println(f.f(6,12,14));
        System.out.println(f.f(0.5,0.6,0.7));
      }
}

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