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