#include<bits/stdc++.h>
using namespace std;
long double a,b,c;
long double m;
int main(){
	cin>>a>>b>>c;
	m=max(a,max(b,c))/(max(a+b,max(b,c))*max(a,max(b,b+c)));
	cout<<fixed<<setprecision(3)<<m<<"\n";
	return 0;
}

一坨代码