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