while

num = 11
increment = 1
while 11 <= num <= 100:
    if num == 20:
        increment = 2
    elif num == 40:
        increment = -1
    elif num == 21:
        num = 41
        increment = 5
    print(num)
    num += increment
    if num > 100:
        print("Number is more than 100")
        break