90分求调qwq

//B2129
#include<bits/stdc++.h>
using namespace std;
double max1(double a,double b, double c){
	double ans = a;
	if(ans <b){
		ans = b;
	}else if(ans<c){
		ans = c;
	}
	return ans;
}
int main (){
double a,b,c,m;
scanf("%lf%lf%lf", &a,&b,&c);
m = max1(a,b,c) / max1(a+b,b,c) / max1(a,b,b+c);
printf("%.3f",m);
return 0;
}