/* 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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