107. 987654321 problem

107. 987654321 problem

time limit per test: 0.25 sec.
memory limit per test: 4096 KB

For given number N you must output amount of N-digit numbers, such, that last digits of their square is equal to 987654321. 

Input

Input contains integer number N (1<=N<=10⁶)

Output

Write answer to the output.

Sample Input

8

Sample Output

0

输出平方之后最后9位为987654321的N位数的个数

暴力发现到N = 9的时候会有8个数

所以N=10时会有9*8个这样的数，而N = 11时有9*10*8个(只与这个数的后9位有关)，N>9时有72+“000...”(N-10)个'0'