# import sys # input = sys.stdin.readline def mp():return map(int,input().split()) def lmp():return list(map(int,input().split())) def mps(A):return [tuple(map(int, input().split())) for _ in range(A)] def stoi(LIST):return list(map(int,LIST)) def itos(LIST):return list(map(str,LIST)) def bitA(X,A):return X & 1<<A == 1<<A import math import bisect import heapq import time from copy import copy as cc from copy import deepcopy as dc from itertools import accumulate, product from collections import Counter, defaultdict, deque def ceil(U,V):return (U+V-1)//V def modf1(N,MOD):return (N-1)%MOD+1 inf = int(1e18+20) mod = int(1e9+7) n = int(input()) a = lmp() a.sort() if n == 1: print(a[0]) elif n == 2: print(a[0]*a[1]) elif n % 2 == 1: print(1) else: print(min(a[0]*a[1], a[2]))