N = int(input())
A = list(map(int,input().split()))

INF = 1 << 120

dp = [A[0], A[0]] # 正の方向、負の方向の最大値

for i in range(1, N):
    new_dp = [-INF, INF]
    new_dp[0] = max(new_dp[0], dp[0] * A[i], dp[0] + A[i], dp[0] - A[i], dp[1] * A[i], dp[1] + A[i], dp[1] - A[i])
    if A[i] != 0:
        new_dp[0] = max(new_dp[0], dp[0] // A[i])
    new_dp[1] = min(new_dp[1], dp[0] * A[i], dp[0] + A[i], dp[0] - A[i],  dp[1] * A[i], dp[1] + A[i], dp[1] - A[i])
    if A[i] != 0:
        new_dp[1] = min(new_dp[1], dp[0] // A[i])
    dp = new_dp

print(dp[0])