import sys
read = sys.stdin.buffer.read
readline = sys.stdin.buffer.readline
readlines = sys.stdin.buffer.readlines

N = int(read())

def f(N):
    if N == 1:
        return 0
    if N % 2 == 0:
        return f(N//2) + 1
    return f(N+1) + 1

print(f(N))