#include <bits/stdc++.h>
	using namespace std;
	int main(){
	int i=0,n;
	cin>>n;
	while(n%2==0){
		n/=2;
		i++;
	} cout<<i;
	}
/**************************************************************
	Problem: 1244
	User: zhuangwenya
	Language: C++
	Result: Accepted
	Time:7 ms
	Memory:2072 kb
****************************************************************/