gets
vs = gets.split.map(&:to_i)

S = Struct.new(:val, :idxs)
a = []

a[0] = S.new(vs[0], [0]) if vs.size > 0
a[1] = S.new(vs[1], [1]) if vs.size > 1
a[2] = S.new(vs[0] + vs[2], [0, 2]) if vs.size > 2

for i in 3...vs.size do
  s_prev = a[i-3].val > a[i-2].val ? a[i-3] : a[i-2]
  a[i] = S.new(s_prev.val + vs[i], s_prev.idxs + [i])
end

s_max = a.size >= 2 && a[-2].val > a[-1].val ? a[-2] : a[-1]
puts s_max.val
puts s_max.idxs.map{|i| i + 1}.join(" ")