import sys

l = int(input())
ls = list(map(int,input().split()))
s = 0
ji = []
ou = []
for l in ls:
    if l%2 == 0:
        ou.append(l)
    else:
        ji.append(l)

s += sum(ou)
lj = len(ji)
if lj%2 == 0:
    s+=sum(ji)
else:
    ji.sort()
    s+=sum(ji[1:])

print(s)