Score : 300 points
You are given an integer N. Among the integers between 1 and N (inclusive), how many Shichi-Go-San numbers (literally "Seven-Five-Three numbers") are there?
Here, a Shichi-Go-San number is a positive integer that satisfies the following condition:
7
, 5
and 3
appears at least once, and the other digits never appear.Input is given from Standard Input in the following format:
N
Print the number of the Shichi-Go-San numbers between 1 and N (inclusive).
575
4
There are four Shichi-Go-San numbers not greater than 575: 357, 375, 537 and 573.
3600
13
There are 13 Shichi-Go-San numbers not greater than 3600: the above four numbers, 735, 753, 3357, 3375, 3537, 3557, 3573, 3575 and 3577.
999999999
26484