#include<bits/stdc++.h>
using namespace std;
int main(){
	int n,c=0;
	cin>>n;
	while(n%2==0){
		n=n/2;
		c++;
	}
	cout<<c;
}
/**************************************************************
	Problem: 1244
	User: fandaohan
	Language: C++
	Result: Accepted
	Time:9 ms
	Memory:2072 kb
****************************************************************/