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 C# (Mono 4.6.2.0) (judge verdict: Wrong Answer)

using System;
using System.Linq;

namespace ConsoleApp1
{
    class Program
    {
        static void Main(string[] args)
        {
           string N = Console.ReadLine();
            int cnt = 0;
            for(int i = 0; i < int.Parse(N); i++)
            {
                if (i.ToString().Contains("3")&& i.ToString().Contains("5") && i.ToString().Contains("7"))
                {
                   if( !i.ToString().Contains("0") && !i.ToString().Contains("1") && !i.ToString().Contains("2")
                   && !i.ToString().Contains("4") && !i.ToString().Contains("6") && !i.ToString().Contains("8")
                   && !i.ToString().Contains("9"))
                   {
                        cnt++;
                   }
                }
            }
            Console.WriteLine(cnt);
        }
    }
}