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) throws Exception {

//    	File file = new File("input.txt");
//    	Scanner sc = new Scanner(file);
    	Scanner sc = new Scanner(System.in);
    	int N = sc.nextInt();
    	int ans = 0;
    	if(N < 357){
    		System.out.println(ans);
    		System.exit(0);
    	}
    	boolean flg_3 = false;
    	boolean flg_5 = false;
    	boolean flg_7 = false;
    	for(int i = 357; i <= N; i += 2){
    		char[] ary = String.valueOf(i).toCharArray();
    		for(char c : ary){
    				if(c == '7'){
        				flg_7 = true;
        			}else if(c == '5'){
        				flg_5 = true;
        			}else if(c == '3'){
        				flg_3 = true;
        			}else{
        				flg_3 =false;
        				break;
        			}
    		}
    		if(flg_3 && flg_5 && flg_7){
    			ans++;
    		}
    		flg_3 = false;
    		flg_5 = false;
    		flg_7 = false;
    	}
    	System.out.println(ans);
    }
}