#include <bits/stdc++.h>
using namespace std;

int main()
{
    int N;
    cin >> N;
    vector<vector<int>> G(N);
    for (unsigned int i = 1; i <= N; i++)
    {
        int bit_count = popcount(i);
        int pre = i - bit_count;
        int next = i + bit_count;
        if (pre >= 1)
        {
            G[i - 1].push_back(pre - 1);
        }
        if (next <= N)
        {
            G[i - 1].push_back(next - 1);
        }
    }
    vector<bool> visited(N);
    auto dfs = [&](auto dfs, int v, int ans = 0)
    {
        ans++;
        if (v == N - 1)
        {
            cout << ans;
            exit(0);
        }
        if (visited[v])
        {
            return;
        }
        visited[v] = true;
        for (auto nv : G[v])
        {
            dfs(dfs, nv, ans);
        }
    };
    dfs(dfs, 0);
    cout << -1;
}