def keisan(N, n ,i):
    p = N // n
    q = N % n
    if p == 1 and q == 0:
        return i
    elif N == p or p >= n:
        n *= 2
        i += 1
    elif p < n:
        n /= 2
        if p > q:
            N = p
        else:
            N = q
        i += 1
    i = keisan(N, n, i)
    return i

N = int(input())
n = 1

print(keisan(N, n, 0))