#include <iostream>
using namespace std;

int main(void){
	int result = 1,p = 1,i,n,v;
	cin >> n;
	for(;p != n;result++){
		for(i = 0,v = p;v > 2;){
			i += v & 1;
			v >>= 1;
		}
		if(p + i + 1 > n){
			if(v == 1){
				result = -1;
				break;
			}
			p -= i + 1;
		} else {
			p += i + 1;
		}
	}
	cout << result << endl;
}