#include<bits/stdc++.h>
using namespace std;
int main()
{
int i,n=0;
cin>>i;
while(i%2==0)
{
 n++;
 i=i/2;
}
cout<<n;
return 0;
} 
/**************************************************************
	Problem: 1244
	User: BUDIN666
	Language: C++
	Result: Accepted
	Time:9 ms
	Memory:2072 kb
****************************************************************/