#include <iostream>
#include <algorithm>
#include <string>
#include <vector>
#include <map>
#include <set>
#include <stdio.h>
#include <cstring>
#include <queue>
#include <stack>
#include <functional>
#include <math.h>
#include <iomanip>
using namespace std;
#define Would
#define you
const int INF = 999999999;
const int MOD = 1e9 + 7;
const double pi = 3.141592653589793238;

long long n, mon;
int main() {
	cin >> n;
	while (n > 1) {
		if (n % 2 == 1) { ++n; }
		else { n /= 2; }
		++mon;
	}
	cout << mon << endl;
}