from collections import * def enum_div(M): L = [[1] for i in range(M + 1)] for i in range(2, M + 1): for j in range(i, M + 1, i): if j not in A: continue L[j].append(i) return L N = int(input()) A = list(map(int, input().split())) D = defaultdict(int) for a in A: D[a] += 1 A = set(A) M = 1010101 DD = enum_div(M) L = [0] * M for k, v in D.items(): for j in DD[k]: L[j] += v for i in range(M-2, -1, -1): L[i] = max(L[i], L[i + 1]) now = 1 for i in range(N): while L[now] + i >= N and L[now + 1] + i >= N: now += 1 print(now)