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