包看懂

#include<iostream>
#include<cmath>
using namespace std;
int main() {
double a,b,c,z,m1,m2,fm,m;
cin >>a>>b>>c;
z=max(a,max(b,c));
m1=max(a+b,max(b,c));
m2=max(a,max(b,b+c));
fm=m1*m2;
m=z/fm;
printf("%.2f",m);
return 0;
}