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 Ruby (2.3.3) (judge verdict: Runtime Error)

N = gets.to_i

points = []
N.times do
  x, y, h = gets.split.map(&:to_i)
  points << [x, y, h]
end

0.upto(101) do |x|
  0.upto(101) do |y|
    sum = []
    points.select {|p| p[2] > 0}.each do |p|
      sum << p[2] + (p[0] - x).abs + (p[1] - y).abs
    end

    # puts "#{points} x: #{x} y: #{y} => #{sum}"

    if sum.uniq.size == 1
      satisfied = true
      points.select {|p| p[2] == 0}.each do |p|
        if sum.first > (p[0] - x).abs + (p[1] - y).abs
          satisfied = false
          break
        end
      end
      if satisfied
        puts "#{x} #{y} #{sum.first}"
        exit 0
      end
    end
  end
end