from random import randint
A = [randint(1, 10000) for i in range(1000)]
Max = 0
for i in range(len(A)):
    for j in range(i + 11, len(A)):
        if (A[i] + A[j]) % 2 * 567 == 0:
            Max = max(Max, A[i] + A[j])
print(Max)