#include <stdio.h>
#include <stdint.h>
uint8_t count_set_bits(uint8_t reg) {
// Your code here
int count=0;
/* for(int i=0;i<8;i++)
{
if((reg>>i)&1)
count++;
}*/
while(reg)
{
count=count+(reg & 1);
reg=reg>>1;
}
return count;
}
int main() {
uint8_t reg;
scanf("%hhu", ®);
printf("%u", count_set_bits(reg));
return 0;
}