import sequtils,strutils

proc cnt(n : int64) : int64 =
    if n < 2:
        return 0
    var p = 1
    while p * 2 + 1 <= n:
        p = p * 2 + 1
    if p == n:
        return 0
    return p + 1 - (n - p) + cnt(n - p - 1) * 2

var
    N = stdin.readline.parseBiggestInt

echo cnt(N)