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

long long x[100005];

int main() {
	ios::sync_with_stdio(false);
	cin.tie(0);
	cout.tie(0);
	
	//freopen("p1.in","r",stdin);
	//freopen("p1.out","w",stdout);
	int n;
	long long ans = 0;
	cin >> n;
	for(int i = 0;i < n;i++) {
		cin >> x[i];
	}
	sort(x,x + n);
	for(int i = n - 1;i >= 0;i--) {
		for(int j = 0;j < n - 1 - i;j++) {
			if(x[i] == 0) break;
			x[i] = sqrt(x[i]);
		}
		ans += x[i];
	}
	cout << ans << endl;
	return 0;
}