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

dp=[[a[0],a[0]] for i in range(n)]

for i in range(n-1):
    t=[]
    t.append(dp[i][0] - a[i+1])
    t.append(dp[i][1] - a[i+1])
    t.append(dp[i][0] + a[i+1])
    t.append(dp[i][1] + a[i+1])
    t.append(dp[i][0] * a[i+1])
    t.append(dp[i][1] * a[i+1])
    if a[i+1] !=0:
        if dp[i][0] < 0 or a[i+1] <0:
            if dp[i][0] < 0 and a[i+1] <0:
                t.append(dp[i][0] // a[i+1])
            else:
                t.append(-(abs(dp[i][0]) // abs(a[i+1])))
        else:
            t.append(dp[i][0] // a[i+1])
        if dp[i][1] < 0 or a[i+1] <0:
            if dp[i][1] < 0 and a[i+1] <0:
                t.append(dp[i][1] // a[i+1])
            else:
                t.append(-(abs(dp[i][1]) // abs(a[i+1])))
        else:
            t.append(dp[i][1] // a[i+1])
    t.sort()
    dp[i+1][0]=t[0]
    dp[i+1][1]=t[-1]

print(dp[-1][1])

# for i in dp:
#     print(i)