Fractions

문제

You are given a positive integer $n$.

Find a sequence of fractions $\frac{a_i}{b_i}$, $i = 1 \ldots k$ (where $a_i$ and $b_i$ are positive integers) for some $k$ such that:

입력

The input consists of a single integer $n$ ($2 \le n \le 10^9$).

출력

In the first line print "YES" if there exists such a sequence of fractions or "NO" otherwise.

If there exists such a sequence, next lines should contain a description of the sequence in the following format.

The second line should contain integer $k$ ($1 \le k \le 100\,000$) — the number of elements in the sequence. It is guaranteed that if such a sequence exists, then there exists a sequence of length at most $100\,000$.

Next $k$ lines should contain fractions of the sequence with two integers $a_i$ and $b_i$ on each line.

예제 입력 1

2

예제 출력 1

NO

예제 입력 2

6

예제 출력 2

YES
2
1 2
1 3

노트

In the second example there is a sequence $\frac{1}{2}, \frac{1}{3}$ such that $\frac{1}{2} + \frac{1}{3} = 1 - \frac{1}{6}$.