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: Wrong Answer)

import java.util.*;
public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int N = sc.nextInt();
        int result = 0;
        for(int i=357; i<N; i++) {
            boolean f_3=false, f_5=false, f_7=false;
            int target = i;
            boolean valid = true;
            while(target>0) {
                int mod = target % 10;
//                System.out.println(String.format("mod=%d", mod));
                target/=10;
//                System.out.println(String.format("target=%d", target));
                switch(mod) {
                    case 3:
                        f_3 = true;
                        break;
                    case 5:
                        f_5 = true;
                        break;
                    case 7:
                        f_7 = true;
                        break;
                    default:
                        valid=false;
                        target=-10;
                        break;
                }
            }
            if(!valid) continue;
            if(f_3 && f_5 && f_7) {
                result++;
            }
        }
        System.out.println(result);
    }
}