def Fib(n):
    if n ==0:
        return 0
    elif n==1:
        return 1
    else:
        return Fib(n-1) + Fib(n-2)


sum=0

for i in range(2, 34):
    if Fib(i)%2==0:
        sum= sum+Fib(i)
        print sum