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 Java (OpenJDK 11.0.6) (judge verdict: Time Limit Exceeded)

import java.io.*;
import java.util.*;

public class Main {
 	public static void main(String args[]) throws IOException {
     	BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
      	int N = Integer.parseInt(br.readLine());
      	int ans = 0, i = 0;
      	while(i <= N) {
         	String tmp = "" + i;
          	boolean flag = true;
          	for(int j = 0;j<tmp.length();j++) {
             	char ch = tmp.charAt(j);
              	if(j != '7' && j != '5' && j != '3') {
                 	flag = false;
                  	break;
                }
            }
          	if(flag) 
              ans++;
        }
      	System.out.println(ans);
    }
}