#include <iostream>
#include <string>
#include <math.h>
#include <algorithm>
#include <utility>
using namespace std;

int N, ans=0;

int main(){
	cin >> N;
	
	while (N != 1){
		if(N % 2 == 0){
			N /= 2; ans++;
		} else {
			N += 1; ans++;
		}
	}
	
	cout << ans << endl;
}