import sys, math

sys.setrecursionlimit(10 ** 6)
stdin = sys.stdin

ni = lambda: int(ns())
na = lambda: list(map(int, stdin.readline().split()))
ns = lambda: stdin.readline().strip()
ntp = lambda: tuple(map(int, stdin.readline().split()))
mod = 10 * 9 + 7
inf = 2 << 60

n = ni()
x = 1

y = math.log2(n)

if y - int(y) == 0:
    print(int(y))

else:
    y = int(y) + 1
    print(y + (x * 2 ** y - n))