//
// binary search
//

public class BSearch {

    public static int bs(int n){
	if (n == 1) return 0;
	return 1 + bs(n/2);
    }
    //
    // and this is log(n)
    //

    public static void main(String[] args) {
	int n = Integer.parseInt(args[0]);
	System.out.println("bs("+ n +") = "+ bs(n));
     }
}