#include <stdio.h>

int main() {
   int n=0;
   int count=0;
   scanf("%d",&n);
   while(n!=1)
   {
    if(n%2==0)
    {
        n=n/2;
    }
    else 
    {
        n=n*3+1;
    }
    count++;
   }
   printf("%d",count);
    return 0;
}