n = int(input()) a = list(map(int, input().split())) max_a = 2200000 al = [0] * max_a for i in a: al[i] += 1 ans = [-1] * (n+1) for i in range(max_a, 0, -1): t = n - sum(al[i::i]) if ans[t] == -1: ans[t] = i mx = -1 for i in range(0, n): if mx < ans[i]: mx = ans[i] print(mx)