n=int(input())
if n==1:
    print(1)
    exit()
import numpy as np
from scipy.sparse import csr_matrix
from scipy.sparse.csgraph import dijkstra
l=[]
for i in range(1,1+n):
    j=bin(i)[2:].count("1")
    if i+j<=n:
        l.append((i,i+j,1))
    if i-j>0:
        l.append((i,i-j,1))
edge=np.array(l,dtype=np.int64).T
graph=csr_matrix(((edge[2],edge[:2]-1)),(n,n))
ans=dijkstra(graph,directed=True,indices=0)

if ans[n-1]==np.float("inf"):
    print(-1)
else:
    print(int(ans[n-1]+1))