import sys
sys.setrecursionlimit(10000000)
MOD = 10 ** 9 + 7
INF = 10 ** 15

from itertools import permutations,product,combinations_with_replacement,groupby,accumulate,combinations
N = int(input())
A = list(map(int,input().split()))
ans = 0
for L in product((0,1,2),repeat = N - 1):
    ret = A[0]
    for i in range(N - 1):
        if L[i] == 0:
            ret += A[i + 1]
        elif L[i] == 1:
            ret -= A[i + 1]
        else:
            ret *= A[i + 1]
    ans = max(ans,ret)
print(ans)