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Problem D
Dividing Sequence
You are given an integer $N$. Your task is to find the longest sequence of integers $a_1<a_2<\dots < a_ k$, such that $a_ i$ divides $a_{i+1}$ and $1 \le a_ i \le N$ for all $i$.
Input
The input contains one line with integer $N, 1\leq N\leq 1\, 000\, 000$.
Output
The first line of output contains the length of the longest sequence. The second line contains space separated numbers $a_1, \ldots , a_ k$ in increasing order.
| Sample Input 1 | Sample Output 1 |
|---|---|
6 |
3 1 3 6 |
