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Contest: Task: Related: TaskB TaskD

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