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

/**************************************************************
	Problem: 1244
	User: cyp
	Language: C++
	Result: Accepted
	Time:8 ms
	Memory:2072 kb
****************************************************************/