101782: [AtCoder]ABC178 C - Ubiquity

Memory Limit:256 MB Time Limit:2 S
Judge Style:Text Compare Creator:
Submit:0 Solved:0

Description

Score : $300$ points

Problem Statement

How many integer sequences $A_1,A_2,\ldots,A_N$ of length $N$ satisfy all of the following conditions?

  • $0 \leq A_i \leq 9$
  • There exists some $i$ such that $A_i=0$ holds.
  • There exists some $i$ such that $A_i=9$ holds.

The answer can be very large, so output it modulo $10^9 + 7$.

Constraints

  • $1 \leq N \leq 10^6$
  • $N$ is an integer.

Input

Input is given from Standard Input in the following format:

$N$

Output

Print the answer modulo $10^9 + 7$.


Sample Input 1

2

Sample Output 1

2

Two sequences $\{0,9\}$ and $\{9,0\}$ satisfy all conditions.


Sample Input 2

1

Sample Output 2

0

Sample Input 3

869121

Sample Output 3

2511445

Input

题意翻译

有一个长为 $n$ 的数列 $a_1,a_2,...,a_n$ ,其中对于每个 $a_i$ 都有 $0≤a_i≤9$ ,并保证数列中至少有一个 $a_i$ 为 $0$ 且至少有一个 $a_i$ 为 $9$ 。输入 $n$ ,输出满足条件的序列的个数对 $10^9+7$ 取模之后的余数。

加入题单

算法标签: