#include<bits/stdc++.h>
using namespace std;
int main(){
    int a,b,c,max1,max2,max3;
    double m;
    cin>>a>>b>>c;
    max1=max(a,max(b,c));
    max2=max(a+b,max(b,c));
    max3=max(a,max(b,b+c));
    m=max1/(max2*max3)*1.0;
    cout<<fixed<<setprecision(3)<<m;
    return 0;
    
    
    
    
}