#include<bits/stdc++.h>
using namespace std;
int a[1000010];
int main ()
{
	ios::sync_with_stdio(0);
	cin.tie(0);
	cout.tie(0);
	int n;
	cin >> n;
	for (int i = 1; i <= n; i++)
	{
		cin >> a[i];
	}
	sort (a + 1, a + n + 1);
	int ans = 0;
	for (int i = n; i >= 1; i--)
	{
		for (int j = i - 1; j >= 1; j--)
		{
			a[j] = sqrt(a[j]);
		}
		ans += a[i];
	}
	cout << ans << endl;
	return 0;
}