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: Time Limit Exceeded)

b=int(input())
th=fi=se=count=0
for i in range(355,b+1):
    m=str(i)
    l=len(m)
    for x in range(l):
        if int(m[x])%2==1:
            if 3==int(m[x]) :th=th+1
            if 5==int(m[x]) :fi=fi+1
            if 7==int(m[x]) :se=se+1
    if l==(th+fi+se) and th!=0 and fi!=0 and se!=0:count=count+1
    th=fi=se=0
print(count)