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


/**************************************************************
	Problem: 1244
	User: cx001
	Language: C++
	Result: Accepted
	Time:9 ms
	Memory:2072 kb
****************************************************************/