a_list = [10,20,30,40,50] 
#print(a_list[0], a_list[3])
#print (a_list[0])

a_list.append(250)
a_list.append(300)
a_list.append(500)

#print (a_list)

##print([].pop())
#print (sum(a_list))
#print(len(a_list))

#print(dir(a_list))

#print(a_list.count(300))

a  = [1,2,3,4,5]
#print (type(a))
a.append("Hello")
print(sum(a))