# !/usr/bin/env python3
# %%
import sys
read = sys.stdin.buffer.read
readline = sys.stdin.buffer.readline
readlines = sys.stdin.buffer.readlines


# %%
N, *V = map(int, read().split())

# %%
dp = [0] * (N + 10)
prev = [-1] * (N + 10)

for i, x in enumerate(V):
    dp[i] = x
    for j in [i - 2, i - 3]:
        if j < 0:
            continue
        if dp[i] < dp[j] + x:
            dp[i] = dp[j] + x
            prev[i] = j

# %%
v = N - 1 if dp[N - 1] > dp[N - 2] else N - 2
path = []
while v != -1:
    path.append(v)
    v = prev[v]


# %%
answers = (x + 1 for x in reversed(path))
print(max(dp[N - 1], dp[N - 2]))
print(' '.join(map(str, answers)))