#include<iostream>
#include<algorithm>
#include<cmath>
using namespace std;
bool cmp(int a,int b)
{
	return a>b;
}
int main()
{
	
	int n;cin>>n;int a[n];
	for(int i=0;i<n;i++)
	{
		cin>>a[i];
	}
	sort(a,a+n,cmp);
	int sum=0;
	for(int i=2;i<=n;i++)
	{
		int localSum=a[i];
		for(int j=1;j<=n-i;j++)
		{
			localSum=sqrt(localSum);
		}
		sum+=localSum;
	}
	cout<<sum;
	return 0;
 }