Problem: Long story short, shashlik is Miroslav's favorite food. Shashlik is prepared on several skewers simultaneously. There are two states for each skewer: initial and turned over.

This time Miroslav laid out n skewers parallel to each other, and enumerated them with consecutive integers from 1 to n in order from left to right. For better cooking, he puts them quite close to each other, so when he turns skewer number i, it leads to turning k closest skewers from each side of the skewer i, that is, skewers number i - k, i - k + 1, ..., i - 1, i + 1, ..., i + k - 1, i + k (if they exist). 

For example, let n = 6 and k = 1. When Miroslav turns skewer number 3, then skewers with numbers 2, 3, and 4 will come up turned over. If after that he turns skewer number 1, then skewers number 1, 3, and 4 will be turned over, while skewer number 2 will be in the initial position (because it is turned again).

As we said before, the art of cooking requires perfect timing, so Miroslav wants to turn over all n skewers with the minimal possible number of actions. For example, for the above example n = 6 and k = 1, two turnings are sufficient: he can turn over skewers number 2 and 5.

Help Miroslav turn over all n skewers.

Input

The first line contains two integers n and k (1 ≤ n ≤ 1000, 0 ≤ k ≤ 1000) — the number of skewers and the number of skewers from each side that are turned in one step.

Output

The first line should contain integer l — the minimum number of actions needed by Miroslav to turn over all n skewers. After than print l integers from 1 to n denoting the number of the skewer that is to be turned over at the corresponding step.

Examples

Input

7 2


Output

2
1 6 


Input

5 1


Output

2
1 4 

Note

In the first example the first operation turns over skewers 1, 2 and 3, the second operation turns over skewers 4, 5, 6 and 7.

In the second example it is also correct to turn over skewers 2 and 5, but turning skewers 2 and 4, or 1 and 5 are incorrect solutions because the skewer 3 is in the initial state after these operations.

Solution (in CPP):

Solution:
#include <bits/stdc++.h>
using namespace std;
int n, k, cnt, a[1005], res[1005];
int khcach, z;
int st;
void nhap() {
  cin >> n >> k;
  khcach = 2 * k + 1;
  z = 2 * k + 1;
}
void setup() {
  while ((n - z) % khcach < k + 1 && z > k + 1) z--;
  if ((n - z) % khcach >= k + 1) {
    st = n - (z - k) + 1;
    res[++cnt] = st;
    while (st - 2 * k - 1 > 0) {
      res[++cnt] = st - 2 * k - 1;
      st -= (2 * k + 1);
    }
  }
  cout << cnt << "\n";
  for (int i = cnt; i >= 1; --i) cout << res[i] << " ";
}
int main() {
  ios_base::sync_with_stdio(0);
  cin.tie(NULL);
  cout.tie(NULL);
  nhap();
  if (k == 0) {
    cout << n << "\n";
    for (int i = 1; i <= n; ++i) cout << i << " ";
    return 0;
  }
  if (n <= khcach) {
    cout << 1 << "\n" << (n + 1) / 2;
    return 0;
  }
  if ((n - z) % khcach == 0) {
    cout << n / khcach << "\n";
    st = k + 1;
    while (st < n) {
      cout << st << " ";
      st += 2 * k + 1;
    }
    return 0;
  }
  setup();
}