Problem:
Score : 300 points

Problem Statement

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:

When the number is written in base ten, each of the digits 7, 5 and 3 appears at least once, and the other digits never appear.

Constraints

1 \leq N < 10^9

N is an integer.

Input

Input is given from Standard Input in the following format:

N

Output

Print the number of the Shichi-Go-San numbers between 1 and N (inclusive).

Sample Input 1

575

Sample Output 1

4

There are four Shichi-Go-San numbers not greater than 575: 357, 375, 537 and 573.

Sample Input 2

3600

Sample Output 2

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.

Sample Input 3

999999999

Sample Output 3

26484

Solution in PHP (5.6.30) (judge verdict: Time Limit Exceeded)

<?php

$num = explode(' ', trim(fgets(STDIN)));
//var_dump($num[0]);
$nums=range(0, $num[0]);
//var_dump($nums);
$count=0;
foreach ($nums as $i) {
    $aryTmp = str_split($i);
//    echo $aryTmp;
    if (!in_array ( 0 , $aryTmp) and
        !in_array ( 1 ,  $aryTmp) and
        !in_array ( 2 ,  $aryTmp) and
        !in_array ( 4 ,  $aryTmp) and
        !in_array ( 6 ,  $aryTmp) and
        !in_array ( 8 ,  $aryTmp) and
        !in_array ( 9 ,  $aryTmp )and
        in_array ( 3 ,  $aryTmp )and in_array ( 5 ,  $aryTmp ) and in_array ( 7 ,  $aryTmp )){$count+=1;}


}
echo $count;
  
?>