#include<bits/stdc++.h>
using namespace std;
int main(){
    int n,c=0;
    cin>>n;
    while(n%2==0){
        n=n/2;
        c++;
    }
    cout<<c;
}
/**************************************************************
	Problem: 1244
	User: linyuhang
	Language: C++
	Result: Accepted
	Time:10 ms
	Memory:2072 kb
****************************************************************/