n=gets.to_i+1
a=(0..n).map{|i|('%b'%i).count ?1};a[0]=1
r=Array.new(n,-1);r[0]=0
n.times{|i|r.include?(i)&&n.times{|j|
r[j]==i||next
x=j-a[j];y=j+j-x
x*r[x]<0&&r[x]=i+1
y<n&&r[y]<0&&r[y]=i+1}}
p r[n-1]