EZ!!!!!!!!!!!!!!!!!!

#include <fstream>
#include<iostream>
using namespace std;
double solve(double a,double b,double c){
double sum=a;
if(sum<b)sum=b;
if(sum<c)sum=c;
return sum;
}double solve1(double a,double b,double c){
double sum=a+b;
if(sum<b)sum=b;
if(sum<c)sum=c;
return sum;
}double solve2(double a,double b,double c){
double sum=b+c;
if(sum<b)sum=b;
if(sum<c)sum=c;
return sum;
}
int main(){
double a,b,c;
cin>>a>>b>>c;
double n=solve(a,b,c)/(solve1(a,b,c)*solve2(a,b,c));
printf("%.2f",n);
return 0;
}