local function mma(x, y)
  return x < y and y or x
end
local function mmi(x, y)
  return x < y and x or y
end
local n = io.read("*n")
local a = {}
for i = 1, n do a[i] = io.read("*n") end
local min, max = 0LL + a[1], 0LL + a[1]
for i = 2, n do
  local c = {}
  c[1] = min + a[i]
  c[2] = min - a[i]
  c[3] = min * a[i]
  if 0 <= min * a[i] then
    c[4] = min / a[i]
  else
    c[4] = -(-min / a[i])
  end
  c[5] = max + a[i]
  c[6] = max - a[i]
  c[7] = max * a[i]
  if 0 <= max * a[i] then
    c[8] = max / a[i]
  else
    c[8] = -(-max / a[i])
  end
  for i = 1, 8 do
    min = mmi(min, c[i])
    max = mma(max, c[i])
  end
end
local str = tostring(max):gsub("LL", "")
print(str)