简单

#include<bits/stdc++.h>
using namespace std;
int main(){
    double a,b,c;
    cin>>a>>b>>c;
    double m=max(max(a,b),c)/(max(max(a+b,b),c)*max(max(a,b),b+c));
    printf("%.2f",m);
    return 0;
}