/* 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
{
{
java.
util.
Scanner i
= new java.
util.
Scanner(System.
in); double t1 = i.nextDouble();
double t2 = i.nextDouble();
double t3 = i.nextDouble();
double t;
t = (t1*t2*t3) / (t1*t2 + t1*t3 + t2*t3);
if(t1
*t2
*t3
== 0) System.
out.
println(t
); else System.
out.
printf("%.2f",t
); }
}
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