# input
n = int(input())

# brute force
answer = 0
for a in range(0, 10):
	for b in range(0, 10):
		if a == b:
			continue
		# 0.ababab... = (pa+b) * (1/p^2 + 1/p^4 + ...) = (pa+b) / (p^2-1)
		l, r = max(a, b), 10 ** 27
		while r - l > 1:
			m = (l + r) // 2
			if n * (m * a + b) > m * m - 1:
				l = m
			else:
				r = m
		answer += l - max(a, b)

# output
print(answer)