import java.util.*;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int N = sc.nextInt();
        int [] c = new int [N+1];
        for(int i=2; i<=N; i++){
            c[i]=10000;
        }
        for(int i=1; i<=N; i++){
            int t=Integer.bitCount(i);
            go(c,i,N);
            if(i-t>=1&&c[i-t]>c[i]+1){
                c[i-t]=c[i]+1;
                go(c,i-t,N);
            }
        }
        int ans=-1;
        if(c[N]!=10000){
            ans=c[N]+1;
        }
        System.out.println(ans);
    }
    static int[] go(int []a, int i, int N){
        int t=Integer.bitCount(i);
        while(i+t<=N){
            a[i+t]=Math.min(a[i+t],a[i]+1);
            i=i+t;
            t=Integer.bitCount(i);
        }
        return a;
    }
}