#include <cassert>
#include <iostream>
#include <vector>
#include <algorithm>
#include <utility>

#define FOR(i, a, b) for (int i = (a); i < (b); i++)
#define RFOR(i, a, b) for (int i = (b)-1; i >= (a); i--)
#define rep(i, n) for (int i = 0; i < (n); i++)
#define rep1(i, n) for (int i = 1; i <= (n); i++)
#define rrep(i, n) for (int i = (n)-1; i >= 0; i--)

#define pb push_back
#define mp make_pair
#define fst first
#define snd second
#define show(x) cout << #x << " = " << x << endl
#define chmin(x, y) x = min(x, y)
#define chmax(x, y) x = max(x, y)
#define pii pair<int, int>
#define vi vector<int>

using namespace std;
template <class S, class T>
ostream& operator<<(ostream& o, const pair<S, T>& p)
{
    return o << "(" << p.first << "," << p.second << ")";
}
template <class T>
ostream& operator<<(ostream& o, const vector<T>& vc)
{
    o << "sz = " << vc.size() << endl
      << "[";
    for (const T& v : vc)
        o << v << ",";
    o << "]";
    return o;
}
typedef long long ll;

int bits(int n)
{
    int c = 0;
    while (n != 0) {
        c += n & 1;
        n /= 2;
    }
    return c;
}


int N;
#define MAX 10001
bool v[MAX + 1];
int main()
{
    cin >> N;
    int num = 1;
    int c = 0;
    bool f = false;
    while (num != N) {
        v[num] = true;
        c++;
        int step = bits(num);
        num += step;
        if (num > N) {
            num -= 2 * step;
        }
        if (num <= 0) {
            f = true;
            break;
        }
        if (v[num]) {
            f = true;
            break;
        }
    }
    if (f) {
        cout << -1 << endl;
    } else {
        cout << c + 1 << endl;
    }

    return 0;
}