#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <cmath>
#include <ctime>
#include <cassert>
#include <iostream>
#include <cctype>
#include <sstream>
#include <string>
#include <list>
#include <vector>
#include <queue>
#include <set>
#include <stack>
#include <map>
#include <utility>
#include <numeric>
#include <algorithm>
#include <iterator>
#include <bitset>
#include <complex>
#include <fstream>
#include <iomanip>
using namespace std;
typedef long long ll;
const double EPS = 1e-9;
typedef vector<int> vint;
typedef pair<int, int> pint;
#define rep(i, n) REP(i, 0, n)
#define ALL(v) v.begin(), v.end()
#define MSG(a) cout << #a << " " << a << endl;
#define REP(i, x, n) for(int i = x; i < n; i++)
template<class T> T RoundOff(T a){ return int(a+.5-(a<0)); }
template<class T, class C> void chmax(T& a, C b){ if(a < b) a = b; }
template<class T, class C> void chmin(T& a, C b){ if(b < a) a = b; }
template<class T, class C> pair<T, C> mp(T a, C b){ return make_pair(a, b); }

int main()
{
	int n, m;
	while(cin >> n >> m && n)
	{
		vint p(n);
		rep(i, n)
			cin >> p[i];

		sort(ALL(p));

		int res = accumulate(ALL(p), 0);
		rep(i, n)
			res -= ((i + 1) % m== 0) * p[n - i - 1];

		cout << res << endl;
	}
}
#include <iostream>
#include <queue>

int main(){
	std::priority_queue<int> p;
	
	int n, m;
	int price;
	while(std::cin >> n >> m){
		int sum_price = 0;
		if(n == 0 && m == 0) break;
		//input
		for(int i = 0; i < n; ++i){
			std::cin >> price;
			p.push(price);
		}
		//袋詰め
		while(!p.empty()){
			for(int i = 1; i <= m && !p.empty(); ++i){
				if(i != m){
					sum_price += p.top();
					p.pop();
				}
				else{
					p.pop();
				}
			}
		}
		std::cout << sum_price << std::endl;
	}
}