# -*- coding: utf-8 -*-
"""
No.642 Two Operations No.1
https://yukicoder.me/problems/no/642

"""
import sys
from sys import stdin
input = stdin.readline


def solve(N):
    ans = 0
    while N != 1:
        if N % 2 == 0:
            N //= 2
        else:
            N += 1
        ans += 1
    return ans


def main(args):
    N = int(input())
    ans = solve(N)
    print(ans)


if __name__ == '__main__':
    main(sys.argv[1:])