المسالة الاولى

#include <iomanip>
#include <iostream>
#include <functional>
#include <algorithm>
using namespace std;
#include <iostream>
using namespace std;
int main()
{
	int n;
	cin >> n;
	long long int a[100000];
	long long sum = 0;
	for (int s = 0; s<n; s++)
	{
		cin >> a[s];
		sum += a[s];
	}
	int temp;
	for (int i = 0; i < n; i++)
	{
		for (int j = 0; j<n - 1; j++)
		if (a[j]>a[j + 1])
		{
			temp = a[j];
			a[j] = a[j + 1];
			a[j + 1] = temp;
		}
	}

	int r = 0;
	int q = -1;
	if (sum % 2 == 1)
	{
		while (r == 0 && q<n + 1)
		{

			q++;
			r = a[q] % 2;
		}
		sum = sum - a[q];
	}

	cout << sum;

	return 0;
}