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