#include<bits/stdc++.h>
using namespace std;
int main()
{
	int n,i=0;
	cin>>n;
	while(n%2==0){
		i++;
		n=n/2;
	}
	cout<<i;
return 0;
}
/**************************************************************
	Problem: 1244
	User: houshanglin
	Language: C++
	Result: Accepted
	Time:11 ms
	Memory:2072 kb
****************************************************************/