~~顾老师~~亲传弟子题解

#include <bits/stdc++.h>
#define ll long long
using namespace std;
ll n,a,s,mj=1e9+1;
int main(){
    cin>>n;
    while(cin>>a){
        s+=a;
        if(a%2==1)mj=min(mj,a);
    }
    if(s%2==1)cout<<s-mj;
    else cout<<s;
    return 0;
}