tj

#include <bits/stdc++.h>
using namespace std;
double solve(double a, double b, double c){
    double max1 = max(max(a, b), c);
    double max2 = max(max(a + b, b), c);
    double max3 = max(max(a, b), b + c);
    double m = max1 / (max2 * max3);
    return m;
}
int main(){
    double a, b, c;
    cin >> a >> b >> c;
    printf("%.2f", solve(a, b, c));
    return 0;
}