#include <bits/stdc++.h>
#define rep(i, a, n) for(int i = a; i < n; i++)
#define repp(i, n) rep(i, 0, n)
#define repb(i, a, b) for(int i = a; i >= b; i--)
#define all(a) a.begin(), a.end()
#define int long long
using namespace std;

signed main(){
    int n;
    cin >> n;
    int ans = 0;
    while(n){
        if(n % 2 == 1) ans ++;
        n /= 2;
    }
    cout << ans << endl;
}