#include<bits/stdc++.h>
using namespace std;
int main()
{
    int n, count = 0;
    scanf("%d", &n);
    while(n > 1)
    {
        if(n%2 == 1) n = n * 3 + 1;
        else n /= 2;
        count++;
    }
    printf("%d\n", count);
    return 0;
}