public class Main { private static void solve() { int n = ni(); long[] a = nal(n); int m = 3; long[] b = new long[1 << m]; for (int i = 0; i < n; i++) { b[i] = a[i]; } for (int j = 0; j < m; j++) { for (int i = 0; i < (1 << m); i++) { if (b[i] < 0) continue; if (((i >> j) & 1) == 0) { if (b[i ^ (1 << j)] < 0) { b[i] = -1; break; } b[i] += b[i ^ (1 << j)]; } } } for (int i = 0; i < (1 << m); i++) { if (b[i] < 0) continue; b[i] = b[i] * b[i]; } for (int j = 0; j < m; j++) { for (int i = 0; i < (1 << m); i++) { if (b[i] < 0) continue; if (((i >> j) & 1) == 0) { if (b[i ^ (1 << j)] < 0) { b[i] = -1; break; } b[i] -= b[i ^ (1 << j)]; } } } long ret = -1; for (int i = 0; i < n; i++) { if (b[i] < 0) continue; if (ret < 0) { ret = b[i]; } else { ret = gcd(ret, b[i]); } } System.out.println(ret); } public static long gcd(long a, long b) { while (b > 0) { long c = a; a = b; b = c % b; } return a; } public static void main(String[] args) { new Thread(null, new Runnable() { @Override public void run() { long start = System.currentTimeMillis(); String debug = args.length > 0 ? args[0] : null; if (debug != null) { try { is = java.nio.file.Files.newInputStream(java.nio.file.Paths.get(debug)); } catch (Exception e) { throw new RuntimeException(e); } } reader = new java.io.BufferedReader(new java.io.InputStreamReader(is), 32768); solve(); out.flush(); tr((System.currentTimeMillis() - start) + "ms"); } }, "", 64000000).start(); } private static java.io.InputStream is = System.in; private static java.io.PrintWriter out = new java.io.PrintWriter(System.out); private static java.util.StringTokenizer tokenizer = null; private static java.io.BufferedReader reader; public static String next() { while (tokenizer == null || !tokenizer.hasMoreTokens()) { try { tokenizer = new java.util.StringTokenizer(reader.readLine()); } catch (Exception e) { throw new RuntimeException(e); } } return tokenizer.nextToken(); } private static double nd() { return Double.parseDouble(next()); } private static long nl() { return Long.parseLong(next()); } private static int[] na(int n) { int[] a = new int[n]; for (int i = 0; i < n; i++) a[i] = ni(); return a; } private static char[] ns() { return next().toCharArray(); } private static long[] nal(int n) { long[] a = new long[n]; for (int i = 0; i < n; i++) a[i] = nl(); return a; } private static int[][] ntable(int n, int m) { int[][] table = new int[n][m]; for (int i = 0; i < n; i++) { for (int j = 0; j < m; j++) { table[i][j] = ni(); } } return table; } private static int[][] nlist(int n, int m) { int[][] table = new int[m][n]; for (int i = 0; i < n; i++) { for (int j = 0; j < m; j++) { table[j][i] = ni(); } } return table; } private static int ni() { return Integer.parseInt(next()); } private static void tr(Object... o) { if (is != System.in) System.out.println(java.util.Arrays.deepToString(o)); } }