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 (2.7.6) (judge verdict: Wrong Answer)

N=int(raw_input())

sum = 0
#flag = 0
sample = set(['7', '5', '3'])

for i in range(3,N+1,10):
#    flag = 0
#    print str(i)

    nums = set(list(str(i)))

    if sample.issubset(nums) and len(nums.difference(sample)) == 0:
        print i
        sum += 1
for i in range(5,N+1,10):
#    flag = 0
#    print str(i)

    nums = set(list(str(i)))

    if sample.issubset(nums) and len(nums.difference(sample)) == 0:
        print i
        sum += 1
for i in range(7,N+1,10):
#    flag = 0
#    print str(i)

    nums = set(list(str(i)))

    if sample.issubset(nums) and len(nums.difference(sample)) == 0:
        print i
        sum += 1


print sum