#include<stdio.h>
#include<stdint.h>


int bitcount( uint8_t x )
{
    int count = 0;

    while( x != 0 )
    {
        x &= x-1;
        count ++;
    }

    return count;
}


int main()
{
    int c_in = 0;

    scanf("%d", &c_in);
    
    printf("%d\n", bitcount( c_in ) );
    


    return 0;
}