AC!

#include <bits/stdc++.h>
using namespace std;
int main()
{
int n;
cin >> n;
int low = 0;
int m = n;
while((m&1)==0)
{
low ++;
m>>=1;
}
int h = 0;
m = n;
while(m>>=1) h ++;
cout << h - low << "\n";
return 0;
}