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 Python (3.4.3) (judge verdict: Accepted)

n=int(input())
c=0
l=[3,5,7]
L=[]
for i1 in l:
  for i2 in l:
    for i3 in l:
      for i4 in l:
        for i5 in l:
          L.append(10000*i1+1000*i2+100*i3+10*i4+i5)
for i in range(min(n+1,10000)):
  l=str(i)
  if '3' in l and '5' in l and '7' in l and '0' not in l and '1' not in l and '2' not in l and '4' not in l and '6' not in l and '8' not in l and '9' not in l:c+=1
for j in L:
  for i in range(j,n+1,100000):
    l=str(i)
    if '3' in l and '5' in l and '7' in l and '0' not in l and '1' not in l and '2' not in l and '4' not in l and '6' not in l and '8' not in l and '9' not in l:c+=1
print(c)