#include <iostream>
using namespace std;

int main()
{
	int n,count=0;
	cin>>n; 
	if(n==0)
	{
		cout<<count;
		return 0;
	}
	
	if(n==1)
	{
		count=1;
		cout<<count;
		return 0;
	}
	
	while(n%2!=0)
	{	
		count++;
		n=n/2;
	}

	cout<<count;

	return 0;
}