#include <iostream>

using namespace std;
const int N = 110;
int a[N];
/*
9 4 3 8 8 9 11 9 8 5
10
*/
int n;
int res = -1;
int main() {
    for (int i = 1; i <= 10; i++) cin >> a[i];
    cin >> n;

    for (int i = 1; i <= 10; i++)
        for (int j = i + 1; j <= 10; j++)
            if (a[i] + a[j] <= n)
                res = max(res, a[i] + a[j]);

    printf("%d", res);
    return 0;
}