#include <bits/stdc++.h>
using namespace std;
using ll = long long;
#define rep(i, n) for (int i = 0; i < (int)(n); i++)

int main() {
    cin.tie(nullptr);
    ios_base::sync_with_stdio(false);
    int n;
    cin >> n;
    int ans = 0;
    while (n != 1 || ans == 0) {
        ans++;
        if (n % 2)
            n = 3 * n + 1;
        else
            n /= 2;
    }
    cout << ans << endl;
    return 0;
}