#t307. 位数问题(bit)
位数问题(bit)
The Digit Problem
Problem Background
Special for beginners, ^_^
Problem Description
Among all -digit numbers, how many have an even number of digit ? Since the result may be very large, you only need to output this answer modulo .
Input Format
Read a number ().
Output Format
Output how many numbers contain an even number of digit .
Sample Input 1
2
Sample Output 1
73
Hint
Among all -digit numbers, have digit and has digits , for a total of .
Constraints
1s, 1024KiB for each test case.