N = int(raw_input())
V = map(int,raw_input().split(" "))
if N == 1:
	print "%d\n1" % V[0]
	quit()
dp = [0 for i in range(N)]
tr = [-1 for i in range(N)]
dp[0] = V[0]; dp[1] = V[1]
for i in range(N-1):
	for j in range(i+2,min(i+4,N)):
		tmp = dp[i] + V[j]
		if dp[j] < tmp:
			dp[j] = tmp
			tr[j] = i
trace = []
if dp[N-1] > dp[N-2]:
	ans, last = dp[N-1], N-1
else:
	ans, last = dp[N-2], N-2
while last != -1:
	trace.append((last+1))
	last = tr[last]
print ans
print " ".join(map(str,sorted(trace)))