#include<bits/stdc++.h> 
using namespace std;
#define int long long
const int M=1e5+10;
int n,a[M],cnt=0,x=0;

signed main(){
	cin>>n;
	for(int i=1;i<=n;++i){
		cin>>a[i];
	}
	sort(a+1,a+n+1,greater<int>());
	for(int i=1;i<=n;++i){
		if(i>=4||a[i-1]==1){
			cnt+=n-3;
			break;
		}
		for(int j=1;j<=x;++j){
			a[i]=sqrtl(a[i]);
		}
		cnt+=a[i];
		x++;
	}
	cout<<cnt<<endl;
	return 0;
}