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

const int INF = 1e9;
const int MOD = 1e9+7;
const ll LINF = 1e18;

#define FOR(i,a,b) for(int i=(a);i<(b);++i)
#define REP(i,n) for(int i=0;i<(n);++i)
#define REPR(i,n) for(int i=n;i>=0;i--)
#define ALL(v) (v.begin(),v.end())
#define COUT(x) cout<<(x)<<'\n'


int main(){
    int n;
    cin >> n;
    int count = 1,t=1;
    while(t!=n){
        int num = __builtin_popcount(t);
        count++;
        t+=num;
        if(t+num>n){
            t = n-(t+num); 
            break;
        }
    }
    if(t%2!=0)COUT(-1);
    else COUT(count);
    return 0;
}