N = int(input())
a = [int(i) for i in input().split()]
ans = a[0]
for i in range(1,N):
	ma = -10**10
	ma = max(ma,ans + a[i])
	ma = max(ma,ans - a[i])
	ma = max(ma,ans * a[i])
	if a[i] != 0:
		ma = max(ma,ans // a[i])
	ans = ma
print(ans)