def solve():
    N = int(input())

    count = 0
    while True:
        if N == 1:
            break
        else:
            if N % 2 == 0:
                N = N//2
                count += 1
            else:
                N = N+1
                count += 1

    print(count)
        

if __name__ == "__main__":
    solve()