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.*;

public class Main{
    public static void main(String args[]){
        Scanner sc = new Scanner(System.in);
        
        int N = sc.nextInt();
        sc.close();
        int count = 0;
        if(N < 357)
            System.out.println(0);
        else{
            for(int i = 357; i <= N; i=i+20){
                if(judge753_1(i) && judge753_2(i))
                    count++;
            }
            for(int i = 375; i <= N; i=i+20){
                if(judge753_1(i) && judge753_2(i))
                    count++;
            }
            for(int i = 573; i <= N; i=i+20){
                if(judge753_1(i) && judge753_2(i))
                    count++;
            }
            System.out.println(count);
        }
    }

    static boolean judge753_1(int N){
        String s = Integer.toString(N);
        if(s.contains("3") && s.contains("5") && s.contains("7"))
            return true;
        else
            return false;
    }
    static boolean judge753_2(int N){
        while(N > 0){
            if(N%10 == 3 || N%10 == 5 || N%10 == 7){
                N = N/10;
            } else
                return false;
        }
        return true;
    }
}