#include<iostream>
#include<string>
#include<math.h>
#include<stdlib.h>
#include<string>
using namespace std;


int main() {
	int n;
	int masu = 1;
	int s = 0;
	int k;
	cin >> n;
	for (int i = 1; i <= 1000000000; i++) {

		if (masu == n) {
			cout << i ;
			break;
		}
		k = masu;
		for (int j = 1; j <= 1000000; j++) {
			s = k % 2 + s;
			k = k / 2 ;
			if (k == 0) {
				break;
			}
		}
		masu = s + masu;
		if (masu > n) {
			masu = masu - s*2;
		}
		s = 0;
		if (i == 100000000) {
			cout << -1;
		}
	}
}