#include <bits/stdc++.h>
using namespace std;
#define int long long

int a[1000005];

signed main()
{
	ios::sync_with_stdio(false);
	cin.tie(0), cout.tie(0);
	int n;
	int ans = 0;
	cin >> n;
	for (int i = 1; i <= n; i++)
	{
		cin >> a[i];
	}
	sort(a + 1, a + n + 1);
	while (a[n] != 0)
	{
		ans += a[n];
		n--;
		for (int i= 1; i <= n; i++)
		{
			a[i] = sqrt(a[i]);
		}
	}
	cout << ans << "\n";
	return 0;
}