#include<bits/stdc++.h>
using namespace std;
int n,s;
int main(){
	cin>>n;
	while(n%2==0){
		s++;
		n/=2;
	}
	cout<<s;
	return 0;
}
/**************************************************************
	Problem: 1244
	User: zhangziang
	Language: C++
	Result: Accepted
	Time:8 ms
	Memory:2072 kb
****************************************************************/