#include<bits/stdc++.h>
using namespace std;
int main(){
	int a=0,n;
	cin>>n;
	while(n%2==0){
		a=a+1;
		n=n/2;
    }
    cout<<a;
}


/**************************************************************
	Problem: 1244
	User: lvrenxiang
	Language: C++
	Result: Accepted
	Time:9 ms
	Memory:2072 kb
****************************************************************/