#include <iostream>

int main()
{
	int N = 0;
	std::cin >> N;
	int *jumpPower = (int*)(malloc(sizeof(int)*N));
	int *result = (int*)(malloc(sizeof(int)*N));
	bool *checked = (bool*)(malloc(sizeof(bool)*N));
	for (int i = 0; i < N; i++) {
		checked[i] = false;
		int k = i + 1;
		jumpPower[i] = 0;
		while (k != 0) {
			jumpPower[i] += (k & 1);
			k >>= 1;
		}
	}
	result[0] = 0;
	for (int i = 1; i < N; i++) {
		result[i] = -1;
	}
	bool hoge = true;
	while (hoge == true) {
		hoge = false;
		for (int i = 0; i < N; i++) {
			if (result[i] != -1 && checked[i] == false) {
				int j = i - jumpPower[i];
				if (j > 0 && (result[j] == -1 || result[j] > result[i])) {
					result[j] = result[i] + 1;
					hoge = true;
				}
				j = i + jumpPower[i];
				if (j == N - 1) {
					std::cout << 2 + result[i] << std::endl;
					return 0;
				}
				else if (j < N - 1 && (result[j] == -1 || result[j] > result[i])) {
					result[j] = result[i] + 1;
					hoge = true;
				}
				checked[i] = true;
			}
		}
	}
	std::cout << -1 << std::endl;
	return 0;
}