#1
print(sum([i ** 2 for i in range(101)]))
answer: 338350

#2
answer: 0 8 16 24 32

#3
print(len([i for i in range (1, 21) if i % 2 == 0]))
answer: 10

#4
x = input().split(', ')
print(len([i for i in range(len(x)) if i % 2 == 0 and int(x[i]) % 2 == 0]))
answer: 3

#5
x = [i for i in range(1, 1000) if i % 7 == 0 or i % 11 == 0]
print(len(x))
answer: 220