백준 1065번 한수

	n = int(input())
	result = 0
	if n <= 99:
	result = n
	else:
	result = 99
	for j in range(100, n+1):
	h = True
	s = str(j)
	length = len(s)
	for i in range(length-2):
	if int(s[i]) + int(s[i+2]) != 2 * int(s[i+1]):
	h = False
	if h:
	result += 1
	print(result)

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