#include<bits/stdc++.h>
using namespace std;
int main(){
    int n,k=0;
    cin>>n;
    while(n%2==0){
    	n=n/2;
    	k=k+1;
    }
    cout<<k;
}
/**************************************************************
	Problem: 1244
	User: sucongyi
	Language: C++
	Result: Accepted
	Time:14 ms
	Memory:2072 kb
****************************************************************/