C++ :

#include <bits/stdc++.h>
using namespace std;
int a[1005];

int main() {
	int n;
	cin >> n;

	for (int i = 0; i <= n; i++)

		cin >> a[i];
	long long _min = 10000000000000000;

	for (int i = 1; i <= n; i++) {

		for (int j = i + 1; j <= n; j++) {

			if (a[i] + a[j] <= a[0] && a[0] - (a[i] + a[j]) < _min) {
				_min = a[i] + a[j];
			}
		}
	}

	cout << a[0] - _min;
	return 0;
}