#include <stdio.h>
int countSetBits(unsigned int n) {
// Write your code here
int counter;
counter = 0;
for(int i = 0;i<32;i++){
if((n>>i)&1){
counter++;
}
}
return counter;
}
int main() {
int n;
scanf("%d", &n);
printf("%d", countSetBits(n));
return 0;
}