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 {
    static int N;

    private static void init() {
        Scanner scanner = new Scanner(System.in);
        N = scanner.nextInt();
        scanner.close();
    }

    private static boolean digitJudge(int i) {
        boolean is7 = false;
        boolean is5 = false;
        boolean is3 = false;
        while (0 < i) {
            int digit = i % 10;
            switch (digit) {
                case 7:
                    is7 = true;
                    break;
                case 5:
                    is5 = true;
                    break;
                case 3:
                    is3 = true;
                    break;
                default:
                    return false;
            }
            i /= 10;
        }
        if(is3 && is5 && is7) {
            return true;
        } else {
            return false;
        }
    }

    public static void main(String[] args) {
        init();

        int ans = 0;
        for(int i = 0; i <= N; i++) {
            if(digitJudge(i)) {
                ans++;
            }
        }
        System.out.println(ans);
    }
}