# End Of File 使用C++輸入及判定終止條件

//片段程式碼
	while(scanf("%d",&n)!= EOF ){
		length=1;
		while(1){
			if(n==1){
				printf("%d\n",length);
				break;
			}
			else if(n%2==1){
				n=(3*n)+1;
# 				length++;
			}
			else{
				n=n/2;
				length++;
			}
		}
	}