n = gets.to_i
sum = 1
i = 1
count = 1
while sum < n
	i = sum
	j = 1
	while i >= j
		sum += 1 if j & i > 0
		j *= 2
	end
	i += 1
	count += 1
	flug = true if sum == n
end

if flug || n == 1
	puts count
else
	puts -1
end