NDCCARD.cpp

#include <bits/stdc++.h>
using namespace std;

int main() {
    if (fopen("in", "r")) {
        freopen("in", "r", stdin);
    }
    cin.tie(0)->sync_with_stdio(0);
    int n, m;
    cin >> n >> m;
    vector<int> a(n + 1);
    for (int i = 1; i <= n; i++) {
        cin >> a[i];
    }
    sort(a.begin() + 1, a.end());
    int ans = 0;
    for (int i = 3; i <= n; i++) {
        int l = 1, r = i - 1;
        while (a[l] + a[r] + a[i] > m && r > 1) r--;
        if (r == 1) break;
        while (a[l] + a[r] + a[i] <= m && r > l) {
            while (a[l + 1] + a[r] + a[i] <= m && l + 1 < r) l++;
            ans = max(ans, a[l] + a[r] + a[i]);
            r--;
        }
    }
    cout << ans << '\n';
}