#!/usr/bin/env python3
# %%
import sys
read = sys.stdin.buffer.read
readline = sys.stdin.buffer.readline
readlines = sys.stdin.buffer.readlines


# %%
N, *A = map(int, read().split())


# %%
def divide(x, y):
    if x == 0:
        return 0
    if not ((x > 0) ^ (y > 0)):
        return x // y
    return - ((-x) // y)

# %%


def gen_nums(x, y):
    yield x + y
    yield x - y
    yield x * y
    if y != 0:
        yield divide(x, y)


# %%
dp = A[0], A[0]
for x in A[1:]:
    nums = list(gen_nums(dp[0], x)) + list(gen_nums(dp[1], x))
    dp = min(nums), max(nums)


print(dp[1])