# coding: utf-8
import array, bisect, collections, heapq, itertools, math, random, re, string, sys, time
sys.setrecursionlimit(10 ** 7)
INF = 10 ** 20
MOD = 10 ** 9 + 7
 
 
def II(): return int(input())
def ILI(): return list(map(int, input().split()))
def IAI(LINE): return [ILI() for __ in range(LINE)]
def IDI(): return {key: value for key, value in ILI()}
 
 
def solve(N, a):
    dp = [[None] * 2 for i in range(N)]
    dp[0][0] = a[0]
    dp[0][1] = a[0]
    for i in range(1, N):
        now_num = a[i]
        if now_num == 0:
            dp[i][0] = min(dp[i - 1][0], 0)
            dp[i][1] = max(dp[i - 1][1], 0)
        else:
            next_list = [dp[i - 1][0] + now_num,
                         dp[i - 1][0] - now_num,
                         dp[i - 1][0] * now_num,
                         dp[i - 1][0] // now_num,
                         dp[i - 1][1] + now_num,
                         dp[i - 1][1] - now_num,
                         dp[i - 1][1] * now_num,
                         dp[i - 1][1] // now_num]
            if next_list[2] < 0:
                next_list[3] = math.ceil(dp[i - 1][0] / now_num)
            if next_list[6] < 0:
                next_list[7] = math.ceil(dp[i - 1][1] / now_num)

            dp[i][0] = min(next_list)
            dp[i][1] = max(next_list)

    ans = dp[N - 1][1]

    return ans


def main():
    N = II()
    a = ILI()
    print(solve(N, a))
 
 
if __name__ == "__main__":
    main()