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

dp = [[0]*2 for _ in range(N)]
dp[0] = [a[0], a[0]]
for i in range(1, N):
    dp[i][0] = max(dp[i-1][0]+a[i], dp[i-1][0]*a[i],
                    dp[i-1][0]-a[i], dp[i-1][1]+a[i],
                    dp[i-1][1]*a[i], dp[i-1][1]-a[i])
    dp[i][1] = min(dp[i-1][0]+a[i], dp[i-1][0]*a[i],
                    dp[i-1][0]-a[i], dp[i-1][1]+a[i],
                    dp[i-1][1]*a[i], dp[i-1][1]-a[i])
    if a[i] != 0:
        dp[i][0] = max(dp[i][0], dp[i-1][0]//a[i], dp[i-1][1]//a[i])
        dp[i][1] = min(dp[i][0], dp[i-1][0]//a[i], dp[i-1][1]//a[i])
print(dp[-1][0])