#include <iostream>
using namespace std;
int main(){
	int n,i=0;
	cin>>n;
	while(n%2==0){
		n=n/2;
		i++;
	}
	cout<<i<<endl;
}
/**************************************************************
	Problem: 1244
	User: admin
	Language: C++
	Result: Accepted
	Time:8 ms
	Memory:2072 kb
****************************************************************/