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
ans = 0

while n != x:
    if x < n:
        x *= 2
        ans += 1
    else:
        d = x - n
        x -= d
        ans += d

print(ans)