#include <iostream>
#include <iomanip>
#include <cstring>
#include <algorithm> 
#include <math.h>
#include <queue>
#include <functional>
#include <map>
#include <vector>
#include <string>
using namespace std;
typedef long long ll;
const ll MOD = 1000000007;
const int INF = 10000000;
ll n;
int main(void){
    cin >> n;
    int ans = 0;
    while (n > 1){
        if (n % 2 == 1) n += 1;
        else n /= 2;
        ans++;
    }
    cout << ans << endl;
}