#include <iostream>

int main()
{
    short int n;
    unsigned short int oneBits;
    
    std::cin >> n;
    
    while (n > 0)
    {
        unsigned short int bit = n % 2;
        n /= 2;
        
        if (bit == 1)
        {
            oneBits++;
        }
    }
    
    std::cout << oneBits;
}