#include <iostream>
#include <vector>
#include <bitset>

using namespace std;

int main(){
	bitset<10001> flag;
	int n;
	cin >> n;
	int* table;
	table = new int[n + 1];
	table[0] = 0;
	for (int i = 0; i < n; i++){
		flag.set(i, true);
		bitset<16> b(i + 1);
		int t = 0;
		for (int j = 0; j < 15; j++){
			if (b[j]) t++;
		}
		table[i + 1] = t;
	}
	flag.set(0, false);
	vector<int> now;
	vector<int> next;
	now.push_back(1);
	if (n == 1){
		cout << "1" << endl;
		goto EXIT;
	}
	for (int i = 0; i < n; i++){
		int len = now.size();
		for (int j = 0; j < len; j++){
			flag[now[j]] = false;
			int tmp1 = now[j] + table[now[j]];
			int tmp2 = now[j] - table[now[j]];
			if (tmp1 == n || tmp2 == n){
				cout << i + 2 << endl;
				goto EXIT;
			}
			if (tmp1 < n&&flag[tmp1] == true){
				flag[tmp1] = false;
				next.push_back(tmp1);
			}
			if (tmp2>0 && flag[tmp2] == true){
				flag[tmp2] = false;
				next.push_back(tmp2);
			}
		}
		now = next;
		next.clear();
	}
	cout << "-1" << endl;
EXIT:
	delete[] table;
	return 0;
}