#include<bits/stdc++.h>
using namespace std;
int main(){
	int n,g=0;
	cin>>n;
	while(n>=2){
		if(n%2==0)g++;
		
		n/=2;
		
	}
	cout<<g;
	return 0;
}

/**************************************************************
	Problem: 1244
	User: tangkaixuan
	Language: C++
	Result: Accepted
	Time:7 ms
	Memory:2072 kb
****************************************************************/