n0 = 10000

list = []
list.append(n0)

# limit = 0

while True:
    cur = list[-1]
    
    if cur % 2 == 0:
        list.append(cur / 2)
    else:
        list.append(3 * cur + 1)
        
    if list[-1] == 1:
        break
        
#     limit += 1
    
#     if limit > 500:
#         break
        
print(int(max(list)))