N=int(input())
a=list(map(int,input().split()))
v1=a[0]
v2=a[0]
for i in range(1,N):
  if a[i]!=0:
    v1=max(v1+a[i],v1-a[i],v1*a[i],v2*a[i],v2//a[i])
    v2=min(v2+a[i],v2-a[i],v1*a[i],v2*a[i],v1//a[i])
  else:
    v1=max(v1+a[i],v1-a[i],v1*a[i],v2*a[i])
    v2=min(v2+a[i],v2-a[i],v1*a[i],v2*a[i])
print(v1)