#include<iostream>
using namespace std;
 
int main() {
double n, Max=0, sum = 0;
//int news;
float a[50];
cin >> n;
 
for (int i = 0; i < n; i++) {
cin >> a[i];
 
if (a[i] >= Max)
Max = a[i];
 
sum += a[i];
}
//for (int i = 0; i < n; i++) {
// a[i] = a[i] / Max * 100;
// sum += a[i];}
// news = sum;
//cout << Max << endl;
//cout << news << endl;
cout << fixed; //소숫점을 고정시켜 표현
cout.precision(2);//() 안의 자리까지 표현 -> 소수점()자리 표현
cout << sum *100 / (3 * Max);
return 0;
}

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