#include <iostream>
#include <algorithm>
#include <vector>
#include <string>
#include <cmath>
#include <iomanip>
#include <map>
using namespace std;
typedef long long LL;

int main(){
    int N;
    cin >> N;
    vector<int> prev, next;
    prev.push_back(0);
    vector<int> arrived(N);
    int cnt = 0;
    int ans = -1;
    if(N == 1) ans = 0;
    while(!prev.empty() && N >= 2){
        cnt++;
        for(int i = 0; i < prev.size(); i++){
            int pos = prev[i];
            if(arrived[pos]) continue;
            arrived[pos] = 1;
            if(pos == N-1){
                ans = cnt;
                break;
            }
            int n = pos+1;
            int bit_cnt = 0;
            while(n > 0){
                bit_cnt += n%2;
                n /= 2;
            }
            if(pos-bit_cnt >= 0){
                next.push_back(pos-bit_cnt);
            }
            if(pos+bit_cnt < N){
                next.push_back(pos+bit_cnt);
            }
        }
        prev = next;
        next.clear();
    }
    cout << ans << endl;
    return 0;
}