#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
#define rep(i, n) for(ll i = 0, i##_len = (n); i < i##_len; i++)
#define reps(i, s, n) for(ll i = (s), i##_len = (n); i < i##_len; i++)
#define rrep(i, n) for(ll i = (n) - 1; i >= 0; i--)
#define rreps(i, e, n) for(ll i = (n) - 1; i >= (e); i--)
#define all(x) (x).begin(), (x).end()
#define sz(x) ((ll)(x).size())
#define len(x) ((ll)(x).length())

int main() {
    cin.tie(0);
    ios::sync_with_stdio(false);
    // ifstream in("input.txt");
    // cin.rdbuf(in.rdbuf());
    ll n;
    cin >> n;
    if (n == 1) {
        cout << 0 << endl;
        return 0;
    }
    ll x = 1;
    vector<ll> two(31);
    rep(i, sz(two)) two[i] = 1LL << i;
    ll ans = lower_bound(all(two), n) - two.begin();
    ll over = two[ans] - n;
    while(over > 0) {
        auto it = upper_bound(all(two), over);
        it--;
        over -= *it;
        ans++;
    }
    cout << ans << endl;
    return 0;
}