#include <iostream>
#include <queue>
using namespace std;

int main() {
	// your code goes here
	priority_queue<long long int> pq;
	long long int n;
	cin>>n;
	for(int i=0;i<n;i++){
		long long int x;
		cin>>x;
		pq.push(x);
	}
	while (pq.size()>1){
		long long int x1,x2;
		x1=pq.top();
		pq.pop();
		x2=pq.top();
		pq.pop();
		pq.push((x2/2+x1));
	}
	cout<<pq.top()<<"\n";
	return 0;
}