#include<iostream>
#include<algorithm>
using namespace std;
long long int a[10000000];
int main()
 {
 	ios::sync_with_stdio(false);
 	long long int n,sum=0;
 	long long int i,j,key;
 	cin>>n;
 	for(i=0;i<n;i++)
 	cin>>a[i];
 /*	for(i=1;i<n;i++)
 	{
 	 j=i-1;
	 key=a[i];
	  while(j>=0&&a[j]<key)
	     {
	      a[j+1]=a[j];
		  j--;	
		 }	
		 a[j+1]=key;
	 }*/
	 sort(a,a+n,greater<int>());
	 for(i=0;i<n;i++)
	 {
	 sum=sum+a[i];	
	 }
	 if(sum%2==0)
	 cout<<sum;
	 else
	 {
	 	while(sum%2!=0)
	 	  { 
	 	   i=n-1;
	 	   sum=sum-a[i];
		   i--;
		   if(i<0)
		   break;  	
		  }
		  cout<<sum;
	 }
	 return 0;
 }