r=[-1]*n=gets.to_i+1
r[0]=0
n.times{|i|r&[i]==[i]&&n.times{|j|
jr[j]==i&&(x=j<1?1:j-('%b'%j).count(?1);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]