别抄代码！

#include<bits/stdc++.h>
#define int long long
using namespace std;
int a,b,c;
double m(int a,int b,int c){
    return 1.0 * max(a,b,c) / (max(a+b,b,c) * max(a,b,b+c));
}
signed main(){
    ios::sync_with_stdio(0);
    cin.tie(0),cout.tie(0);
    cin>>a>>b>>c;
    cout<<fixed<<setprecision(3)<<m(a,b,c);
    return 0;
}