#include<bits/stdc++.h>
using namespace std;
#define ll long long
int n,a[100010],ans,tmp=1;
bool cmp(int a,int b){
	return a>b;
}
signed main(){
	cin>>n;
	for(int i=1;i<=n;i++){
		cin>>a[i];
	}
	sort(a+1,a+1+n,cmp);
	for(int i=1;i<=n;i++){
		ans+=int(pow(a[i],double(1.00/tmp)));
		tmp*=2;
	}
	cout<<ans<<"\n";
	return 0;
}