n = int(input())
ch = []
nch = []

for i in range(n):
    a = int(input())
    if a % 2 == 0:
        ch.append(a)
    else:
        nch.append(a)

ch.sort()
nch.sort()

if len(ch) % 2 == 1:
    ch[0] = 0
if len(nch) % 2 == 1:
    nch[0] = 0

if len(ch) == 1 and len(nch) == 1:
    print(-1)
else:
    print(sum(ch) + sum(nch))