import sys
read = sys.stdin.buffer.read
readline = sys.stdin.buffer.readline
readlines = sys.stdin.buffer.readlines
sys.setrecursionlimit(10 ** 7)

n = int(readline())
for i in range(10 ** 9):
    if n == 1:
        print(i)
        break
    if n % 2 == 0:
        n //= 2
    else:
        n += 1