nikdissv

print("1-e:")

for i in range(10, 21):

if i%2==0: # Проверка на чётность

print(i)

print()

print("2-e:")

s = 0

for i in range(15, 31):

s += i

print(s)

print()

print("3-e:")

for i in range(20, 31):

print(i**3)