Bathe
说明
Peter is a cleanly boy.One day,he finds that the number of cabinet has not been the
number '4' when he goes to the bathhouse . Peter is curious about that .Maybe , in the
opinion of boss of bathhouse, '4' is a unlucky number .
Now Peter knows the biggest number of the cabinet N , can you help Peter to calculate
the amount of cabinet in total?
输入格式
The input contains many test cases . Each line has a positive integer N.
( 1 <= N <= 50000 )
输出格式
For each test case, you should output one line . That is, Output the amount of cabinet.
3
53
4