579A - Raising Bacteria - CodeForces Solution

#include <bits/stdc++.h>
 
// was created by Ali Karim
#define ioiismine ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
#define ll long long
#define yes cout << "YES" << endl
#define no cout << "NO" << endl
using namespace std;

const int N = 2e6 - 1;
int n , cnt = 0 , a[N] , b , k , c , z[N] ,  cnt2 = 0 , sum = 0 , m , d , mx2 = 0 , x , y , cnt3 = 0;
bool v1[N];
vector <long long> v;
map <int, int> mp;
set <int> st;
ll mx = 1e18, l;
string s , f[N] , j[N];
char e , g;
void solved_by_ali(){
	cin >> n;
    for (int i = 1; i <= n; i *= 2) {
        if (n & i) cnt ++;
    }
    cout << cnt;
}
int main()
{
    ioiismine
    int t = 1;
    //cin >> t;
    while (t--){
        solved_by_ali();
    }

    return 0;
}