#include <bits/stdc++.h>
#define rep(i,n) for(int i = 0; i < (n); i++)
using namespace std;
typedef long long ll;

int main(){
    cin.tie(0);
    ios::sync_with_stdio(0);

    int N; cin >> N;
    vector<int> c(N+1,0);
    vector<bool> used(N+1,false);
    rep(i,N) c[i+1] = __builtin_popcount(i+1);

    int now = 1, cnt = 0;
    while(1){
        cnt++;

        if(now == N){
            cout << cnt << endl;
            return 0;
        }

        if(now + c[now] <= N){
            now += c[now];
        }else{
            now -= c[now];
            if(used[now]){
                cout << -1 << endl;
                return 0;
            }else{
                used[now] = true;
            }
        }
    }
}