#include<bits/stdc++.h>
using namespace std;
int main(){
	int n,h=0;
	cin>>n;
	for(;n%2==0;){
		h++;
	}
	cout<<h;
}
/**************************************************************
	Problem: 1244
	User: linzihang
	Language: C++
	Result: Time Limit Exceed
****************************************************************/