#include<bits/stdc++.h>
using namespace std;
int n,a[100010],ans;
int main(){
	cin>>n;
	for(int i = 0;i<n;i++)cin>>a[i];
	sort(a,a+n);
	for(int i = n-1;i>=0;i--){
		int w = pow(1.0*a[i],1.0*pow(1.0/2,0.0+n-i-1));
		if(w<1)w=1;
		//cout<<w<<" ";
		ans+=w;
	}
	//cout<<"\n";
	cout<<ans;
	return 0;
}