#include <stdio.h>
#include <stdint.h>
int main()
{
	int c = 0;
	uint64_t n;
	scanf("%llu",&n);
	for (;;) {
		if (n % 2 == 1) c++;
		if (n == 1) break;
		n /= 2;
	}
	printf("%d\n",c);
}