import sys, math

sys.setrecursionlimit(10 ** 6)
stdin = sys.stdin

ni = lambda: int(ns())
na = lambda: list(map(int, stdin.readline().split()))
ns = lambda: stdin.readline().strip()
ntp = lambda: tuple(map(int, stdin.readline().split()))
mod = 10 * 9 + 7
inf = 2 << 60

n = ni()
ans = 0

while n != 1:
    if n % 2 == 0:
        n /= 2
    else:
        n += 1
    ans += 1

print(ans)