import java.util.Scanner;
class Main{
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		sub s = new sub();
		int goal = sc.nextInt();
		int num = 1,cnt = 0;
		
		boolean[] flug = new boolean [goal];
		flug[0] = true;
		
		while(num < goal) {
			int t = s.counter(num);
			if(t + num > goal) {//ゴールを超える場合
				num -= t;
			}else {
				num += t;
			}
			
			if(flug[num - 1] == true) {//同じところに2回訪れたら到達不可能
				System.out.println(-1);
				return;
			}else {
				flug[num - 1] = true;
			}
			cnt++;
		}
		
		System.out.println(cnt + 1);
	}
}


class sub{
	int counter(int num) {
		int count = 0;
		for(int i = num ; i > 0 ; i = i / 2) {
			if(i % 2 == 1) count++;
		}
		return count;
	}
}