#include<bits/stdc++.h>
using namespace std;
int main(){
	int n,i=0;
	cin>>n;
	while(!(n&(1<<i)))i++;
	cout<<i;
	return 0;
}

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

using namespace std;
int main(){
	int n,o=0;
	cin>>n;
	while(n%2==0){
		o++;
		n=n/2;
	}
	cout<<o;
	return 0;
}

using namespace std;
int main(){
    int o=0,n;
    cin>>n;
    while(n%2==0){
       o++;
       n=n/2;
	}
cout<<o;
return 0;
}