import java.util.*;

public class Main {
	public static void main (String[] args) {
		Scanner sc = new Scanner(System.in);
		int n = sc.nextInt();
		int[] dp = new int[n + 3];
		ArrayList<ArrayList<Integer>> lists = new ArrayList<>();
		for (int i = 0; i < n + 3; i++) {
		    lists.add(new ArrayList<>());
		}
		for (int i = 3; i < n + 3; i++) {
		    int x = sc.nextInt();
		    if (dp[i - 3] < dp[i - 2]) {
		        lists.get(i).addAll(lists.get(i - 2));
		        dp[i] = dp[i - 2] + x;
		    } else {
		        lists.get(i).addAll(lists.get(i - 3));
		        dp[i] = dp[i - 3] + x;
		    }
		    lists.get(i).add(i - 2);
		}
		int ans;
		ArrayList<Integer> ansList;
		if (dp[n + 2] > dp[n + 1]) {
		    ans = dp[n + 2];
		    ansList = lists.get(n + 2);
		} else {
		    ans = dp[n + 1];
		    ansList = lists.get(n + 1);
		}
		System.out.println(ans);
		StringBuilder sb = new StringBuilder();
		for (int i = 0; i < ansList.size(); i++) {
		    if (i > 0) {
		        sb.append(" ");
		    }
		    sb.append(ansList.get(i));
		}
		System.out.println(sb);
	}
}