#include <stdio.h>

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