#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
const ll INF=1e18;
int main(){
    int n;cin >> n;
    vector<ll> d(n+1,INF);
    vector<vector<int>> g(n+1);
    for(int i=1;i<=n;i++){
        int cnt=0;
        for(int j=0;j<5;j++){
            if((i>>j)&1){
                cnt++;
            }
        }
        if(i-cnt>=1){
            g[i].push_back(i-cnt);
        }
        if(i+cnt<=n){
            g[i].push_back(i+cnt);
        }
    }
    priority_queue<pair<ll,ll>,vector<pair<ll,ll>>,greater<pair<ll,ll>>> pq;
    d[1]=1;
    pq.push({0,1});
    while(!pq.empty()){
        ll u=pq.top().first,v=pq.top().second;
        pq.pop();
        if(d[v]<u){
            continue;
        }
        for(auto x:g[v]){
            if(d[x]>d[v]+1){
                d[x]=d[v]+1;
                pq.push({d[x],x});
            }
        }
    }
    if(d[n]==INF){
        cout << -1 << endl;
    }
    else{
        cout << d[n] << endl;
    }
}