#include<iostream>
using namespace std;
int main()
{
ios::sync_with_stdio(0);
cin.tie(0);
int a,b=0,c;
while(cin>>a)
{
if(a==0) break;
c=a+1;
while(c>0)
{
if(c%2==1) break;
c/=2;
b++;}
cout<<b<<"\n";
b=0;}
}