import java.util.Arrays;
import java.util.Scanner;

public class Main {
	
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        
        int N = sc.nextInt();
        
        if (N == 1) {
        	System.out.println(0);
        	return;
        }
        
        int[] map = new int[N+1];
        for (int i = 1; i <= N; i++) {
        	map[i] = Integer.bitCount(i);
        }
        
        boolean[] comp = new boolean[N+1];
        for (int i = 1; i < N; i++) {
        	int p = i;
        	while(p < N) {
        		if (p+map[p] == N) {
        			comp[i] = true;
        		}
        		
        		p += map[p];
        	}
        }
        
        boolean bad = true;
        for (boolean flg : comp) {
        	if(flg)
        		bad = false;
        }
        
        if (bad) {
        	System.out.println(-1);
        	return;
        }
        
        int[] dp = new int[N+1];
        Arrays.fill(dp, Integer.MAX_VALUE-500);
        int count = 0;
        for (int i = 1; i <= N; i+=map[i]) {
        	count++;
        	dp[i] = count;
        	
        }
        
        boolean changed = true;
        while(changed) {
        	changed = false;
        	for (int i = 1; i <=N; i++) {
        		if (i-map[i] > 0 && dp[i-map[i]] > dp[i]+1) {
        			dp[i-map[i]] = dp[i]+1;
        			changed = true;
        		}
        		
        		if (i+map[i] <= N && dp[i+map[i]] > dp[i]+1) {
        			dp[i+map[i]] = dp[i]+1;
        			changed = true;
        		}
        	}
        }
        
        System.out.println(dp[N]);
    }
}