n = int(raw_input())
a = [n+1 for i in range(n)]
a[0] = 1
next = [0]
for i in next:
	s = bin(i+1).count("1")
	f = i+s
	b = i-s
	if 0 < f < n and a[f] > a[i]+1:
		a[f] = a[i]+1
		next.append(f)
	if 0 < b < n and a[b] > a[i]+1:
		a[b] = a[i]+1
		next.append(b)
print a[-1] if a[-1] < n or n == 1 else -1