PAT(B1001)

code:

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