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 Java8 (OpenJDK 1.8.0) (judge verdict: Time Limit Exceeded)

import java.util.Scanner;

public class Main {
  public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    int upLimit = sc.nextInt();
    int ans = 0;
    for (int i = 357; i <= upLimit; i += 2) {
      boolean is7 = false;
      boolean is5 = false;
      boolean is3 = false;
      boolean others = true;
      String str = new String().valueOf(i);
      for (int j = 0; j < str.length(); j++) {
        if (str.charAt(j) == '7') {
          is7 = true;
        } else if (str.charAt(j) == '5') {
          is5 = true;
        } else if (str.charAt(j) == '3') {
          is3 = true;
        } else {
          others = false;
        }
      }
      if (is7 && is5 && is3 && others) {
        ans++;
      }
    }
    System.out.println(ans);
  }

}