#!/usr/bin/env python3
from collections import deque


dpos4 = ((1, 0), (0, 1), (-1, 0), (0, -1))
dpos8 = ((0, -1), (1, -1), (1, 0), (1, 1), (0, 1), (-1, 1), (-1, 0), (-1, -1))
mod1 = 10**9 + 7
mod2 = 998244353
inf = 1 << 60


def main():
    N = int(input())
    ans = 0
    while N > 1:
        ans += 1
        if N % 2 == 0:
            while N % 2 == 0:
                N //= 2
        else:
            N += 1
    print(ans)


if __name__ == "__main__":
    main()