#include <stdio.h>
#include <stdlib.h>

int main(void)
{
    unsigned int n;
    scanf("%u", &n);

    int ans = 0;

    for (int i = 0; i < sizeof(n) * 8; ++i)
        ans += (n & (1 << i)) >> i;

    printf("%d", ans);
    return 0;
}