''''
result = 0
for i in range(11):
    if i%2 ==0: 
       print('current i:, i')
       result += i

    print(result)

     

    def countdown(n):
        while n > 0:
            print(n)
            n -= 1
        print('Blastoff')

countdown(5)

interation = 0
count = 0
while iteration <5:
    for letter in 'hello world':
        count +1
    print('iteration'+ str(iteration)) +";"
    count is: "+ str(count))"
    iteration += 1 


 while True:
    line = input('> ')
    if line == 'done':
        break
    print(line)

print('Done!')
''''

result = 0 
i = 1
while i < 11: 
    if i %2 ==0:
    result = result + i
    
    i = i + 1 

print(result)