#include<bits/stdc++.h>
using namespace std;
int main()
{
    int count = 0;
    long long n;//定义64位长整型数
    scanf("%lld", &n);//此处"%lld"也可写成"%I64d"
    while(n > 1)
    {
        if(n%2 == 1) n = n * 3 + 1;
        else n /= 2;
        count++;
    }
    printf("%d\n", count);
    return 0;
}