import sys

n=int(input())
pack=list(map(int,input().split()))
s=0
mini=20000
for i in range(n):
    s+=pack[i]
    if pack[i]%2!=0 and mini>pack[i]:
        mini=pack[i]

if s%2==0:
    print(s)
else:
    print(s-mini)