#include "bits/stdc++.h"
using namespace std;
int bitCount(int bits) {
    int cnt = 0;
    for(int mask = 1; mask != 0; mask<<=1) {
        if( (bits & mask) != 0 )
            ++cnt;
    }
    return cnt;
}
int main()
{
    int N = 0;
    cin >> N;
    int count = 0;
    int pos = 1;
    int prev = 0;
    while(1)
    {
        if(pos ==N) break;
        int c = bitCount(pos);
        pos += c;
        if(pos > N)
        {
            pos -=2*c;
            if(prev == pos)
            cout << -1 << endl;
            return 0;
        }
        ++count;
    }
    cout << count << endl;
    return 0;
}