CodeForces 1415E New Game Plus!

/*

p_b_p_b txdy
AThousandSuns txdy
Wu_Ren txdy
Appleblue17 txdy

*/

#include <bits/stdc++.h>
#define pb emplace_back
#define fst first
#define scd second
#define mems(a, x) memset((a), (x), sizeof(a))

using namespace std;
typedef long long ll;
typedef unsigned long long ull;
typedef long double ldb;
typedef pair<ll, ll> pii;

const int maxn = 500100;

ll n, m, a[maxn], b[maxn];

void solve() {
	scanf("%lld%lld", &n, &m);
	for (int i = 1; i <= n; ++i) {
		scanf("%lld", &a[i]);
	}
	sort(a + 1, a + n + 1, greater<ll>());
	ll ans = 0;
	priority_queue<ll> pq;
	for (int i = 0; i <= m; ++i) {
		pq.push(0);
	}
	for (int i = 1; i <= n; ++i) {
		ll x = pq.top();
		pq.pop();
		ans += x;
		pq.push(x + a[i]);
	}
	printf("%lld\n", ans);
}

int main() {
	int T = 1;
	// scanf("%d", &T);
	while (T--) {
		solve();
	}
	return 0;
}