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

/**************************************************************
	Problem: 1244
	User: zy002
	Language: C++
	Result: Accepted
	Time:11 ms
	Memory:2072 kb
****************************************************************/