#include <bits/stdc++.h>
using namespace std;

int main(){
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);

    long long X; cin >> X;
    __int128_t x = X;
    int answer = 0;
    while(x != 1){
        if(x&1) x = x*3+1;
        else x >>= 1;
        answer++;
    }
    cout << answer << endl;
}