#include <iostream>
#include <algorithm>
using namespace std;

#define MAX 10100
#define INF 1000000007

int N;
int dp[MAX + 1];

void dfs(int now) {
	int cnt = __builtin_popcount(now);
	int next1 = -1, next2 = -1;
	if (now + cnt <= N) {
		if (dp[now] + 1 < dp[now + cnt]) {
			dp[now + cnt] = dp[now] + 1;
			next1 = now + cnt;
		}
	}
	if (0 < now - cnt) {
		if (dp[now] + 1 < dp[now - cnt]) {
			dp[now - cnt] = dp[now] + 1;
			next2 = now - cnt;
		}
	}
	if (0 < next1) dfs(next1);
	if (0 < next2) dfs(next2);
}

int main() {
	cin >> N;
	
	for (int i = 2; i <= N; i++) dp[i] = INF;
	
	dp[1] = 1;
	dfs(1);
	
	cout << (dp[N] == INF ? -1 : dp[N]) << '\n';
	
	return 0;
}