**Time limit:**1.00 s**Memory limit:**512 MB

There are n children at a Christmas party, and each of them has brought a gift. The idea is that everybody will get a gift brought by someone else.

In how many ways can the gifts be distributed?

# Input

The only input line has an integer n: the number of children.

# Output

Print the number of ways modulo 10^9+7.

# Constraints

- 1 \le n \le 10^6

# Example

Input:

4

Output:

9