Python. 8 класс. While

 n = 8 
i = 0 
sum = 0 
while i <= n: 
    if i%2 == 0: 
        sum += i 
    i += 1 
print(sum) 

 i, n, res = 0, int(input()), 0 
while i != n+1:  # n включительно
    if i % 2 == 0:
        res += i 
    i += 1 
print(res)