#pragma GCC optimize("O3")
#pragma GCC optimize("unroll-loops")
#include <bits/stdc++.h>
#include <atcoder/all>
using namespace std;
typedef long long ll;
const int INF = 1<<30;
const ll INFLL = 1LL<<60;
const ll MOD = 998244353;
const double INFD = 1.0E10;
const int dx[4] = {1, 0, -1, 0};
const int dy[4] = {0, -1, 0, 1};
map<int, char> dm = {{0, 'D'}, {1, 'L'}, {2, 'U'}, {3, 'R'}};
// const int dx[8] = {1, 1, 0, -1, -1, -1, 0, 1};
// const int dy[8] = {0, 1, 1, 1, 0, -1, -1, -1};
using Pair = pair<ll, ll>;
using mint = atcoder::modint998244353;
// using mint = atcoder::modint1000000007;




int main(){
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    cout << fixed << setprecision(15);
    
    ll n; cin >> n;
    if (n == 1){
        cout << 1 << endl;
        return 0;
    }
    ll cnt = 0;
    while (n != 1){
        if (n % 2) n = 3 * n + 1;
        else n /= 2;
        cnt++;
    }
    
    cout << cnt << endl;
    
    return 0;
}