n = int(input())
ans = n
for i in range(2, 70):
	l, r = 0, 10 ** 18
	while r - l > 1:
		m = (l + r) // 2
		if m ** i > n:
			r = m
		else:
			l = m
	ans = min(ans, i + l + (n - l ** i))
print(ans)