#include <bits/stdc++.h>
#define ll long long
using namespace std;
bool cmp(ll a,ll b)
{
	if (a != b)
	{
		return a > b;
	}
}
int main()
{
	ll n,s = 0;
	cin >> n;
	ll a[n+1];
	for (int i = 1;i<=n;i++)
	{
		cin >> a[i];	
	}
	sort(a+1,a+n+1,cmp);
	for (int i = 1;i<=n;i++)
	{
		for (int j = 1;j<=i-1;j++)
		{
			a[i] = sqrt(a[i]);
		}
		s += a[i];
	}
	cout << s;
	return 0;
}