#include<iostream>
using namespace std;
int main() {
int n, x, min = 1000000000, sem = 0;
cin >> n;
for (int i = 1; i <= n; i++) {
cin >> x;
int cx = x, k = 0, s = 0;
while (cx != 0)
s += cx % 10, cx /= 10;
for (int d = 1; d <= s; d++)
if (s % d == 0)
k++;
if (k == 2)
if (x < min)
min = x, sem = 1;
}
if (sem == 1)
cout << min;
else
cout << "NU EXISTA!";
return 0;
}