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

int main(){
	int n, res = 0; cin >> n;
	vector<int> v(n + 1);
	for (int i = 1; i <= n; i++) 
		cin >> v[i];
	sort(v.begin() + 1, v.end());
	for (int i = n, cnt = 0; i; i--, cnt++) {
		for (int m = cnt; m--; v[i] = sqrt(v[i]));
		res += v[i];
	}
	cout << res; 
	return 0;
}