PAT-B1001

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


return 0;
}