n=int(input())
a=[]
c=n
a.append(c)
sum=c
while c:
    c//=2
    a.append(c)
    sum+=c
ma=sum
b=sum
while len(a):
    ma=max(ma,sum+a[len(a)-1])
    sum-=a[len(a)-1]
    a.pop()
print(ma-b)