## https://yukicoder.me/problems/no/642

from collections import deque

def main():
    N = int(input())
    if N == 1:
        print(0)
        return

    dp = {N: 0}
    queue = deque()
    queue.append(N)
    while len(queue) > 0:
        n = queue.popleft()

        d = dp[n]
        n1 = n + 1
        if n1 not in dp:
            dp[n1] = d + 1
            if n1 == 1:
                break
            queue.append(n1)

        if n % 2 == 0:
            n2 = n // 2

            if n2 not in dp:
                dp[n2] = d + 1
                if n2 == 1:
                    break
                queue.append(n2)
    
    print(dp[1])
    





if __name__ == '__main__':
    main()