cpa_lab_2_4_23_(1)-A.cpp

#include <iostream>

using namespace std;

int main()
{
    unsigned long counter = 0;
    int var;
    cout << "Enter a number: ";
    cin >> var;

    while(var)
    {
        counter += var & 1;
        var >>= 1;
    }

    cout << counter;
    return 0;
}