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 (Python):


def 解():
	iN = int(input())
	aF = 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	for i in range(len(aF)):
		if iN <= aF[i]:
			if iN == aF[i]:
				print(i+1)
			else:
				print(i)
			exit()
	print(i+1)
解()