import java.util.*;

//数字の二進数の1の数を求めるクラス
//intは整数型なので、小数点以下は切り捨てられる
class Kazu{
    int ichi = 0;
    public int program1(int num){
        do{
            //numを2で割り切れなかった場合ichiの数を増やしていく
            if(num%2==1){
                ichi = ichi+1;
            }
            //numに2で割った後の数を入れる
            num = num/2;
        }while(num==0);
        return ichi;
    }
}

class Tasu{
    int t_kekka = 0;
    public int program2(int num,int ichi){
        t_kekka = num + ichi;
        return t_kekka;
    }
}

class Hiku{
    int h_kekka = 0;
    public int program3(int num,int ichi){
        h_kekka = num - ichi;
        return h_kekka;
    }
}

public class Main{
    public static void main(String[] args){
        Scanner sc = new Scanner(System.in);
        int N = sc.nextInt();
        
        int num = 1;
        int ichi = 0;
        int t_kekka = 0;
        int h_kekka = 0;
        int flag = 0;
        int kaisu = 0;
        
        do{
            kaisu = kaisu + 1;
            Kazu kz = new Kazu();
            ichi = kz.program1(num);
            
            Tasu ts = new Tasu();
            t_kekka = ts.program2(num,ichi);
            
            if(t_kekka==N){
                break;
            }else if(t_kekka>N){
                flag = flag + 1;
                Hiku hk = new Hiku();
                h_kekka = hk.program3(num,ichi);
                num = h_kekka;
                if(flag==2){
                    kaisu = -1;
                }
            }else if(t_kekka<N){
                num = t_kekka;
            }
    }while(flag<2);
    System.out.println(kaisu);
    }
}