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

#define FOR(i,a,b) for(int i=(a);i<(int)(b);i++)
#define rep(i,n) FOR(i,0,n)
#define ZERO(a) memset(a,0,sizeof(a))

bool visited[10010];

int calc(int n) {
    int res = 0;
    while(n) {
        if(n & 1) res++;
        n >>= 1;
    }
    return res;
}

int main() {
    ZERO(visited);
    int n; cin>>n;
    vector<int> a(10010);
    rep(i,n+1) a[i] = calc(i);

    int ans = 0, pos = 1;
    while(1) {
        ans++;
        visited[pos] = 1;
        if(n == pos) break;
        pos += (pos+a[pos] <= n ? a[pos] : -a[pos]);
        if(visited[pos]) {
            cout << -1 << "\n";
            return 0;
        }
    }

    cout << ans << "\n";

    return 0;
}