N = int(input())
count = 0
pw = 1
while pw != N:
	pw = pw * 2
	if pw >= N:
		break
	count += 1
rest = N - pw / 2
if rest == 0:
	print(count)
elif rest == 1:
	print(count + 1)
elif rest%2 == 0:
	print(count + 1)
else:
	print(count + 2)