#include <cstdio>
#include <cctype>
#include <utility>
#include <vector>
#include <algorithm>
using namespace std;

#define gcu getchar_unlocked
#define pcu putchar_unlocked
#define _T template <typename T>
#define _HT template <typename H, typename... T>
#define _il inline
#define _in _il int in
#define _sc _il bool scan
_T T in(int c){T n=0;bool m=false;while(isspace(c)){c=gcu();}if(c=='-')m=true,c=gcu();
	do{n=10*n+(c-'0'),c=gcu();}while(c>='0'&&c<='9');return m?-n:n;}
_in() {return in<int>(gcu());}
_T T scan(T &n){int c=gcu();return c==EOF?false:(n=in<T>(c),true);}
_sc(char &c){c=gcu();gcu();return c!=EOF;}
#ifdef _GLIBCXX_STRING
_sc(string &s){int c;s="";
	for(;;){c=gcu();if(c=='\n'||c==' ')return true;else if(c==EOF)return false;s+=c;}}
#endif
_HT _sc(H &h, T&&... t){return scan(h)&&scan(t...);}
#define _vo _il void out
#define _vl _il void outl
_vo(bool b) {pcu('0'+b);}
_vo(const char *s){while(*s)pcu(*s++);}
_vo(char c){pcu(c);}
#ifdef _GLIBCXX_STRING
_vo(string s){for(char c:s)pcu(c);}
#endif
_T _vo(T n){static char buf[20];char *p=buf;
	if(n<0)pcu('-'),n*=-1;if(!n)*p++='0';else while(n)*p++=n%10+'0',n/=10;
	while (p!=buf)pcu(*--p);}
_vl(){out('\n');}
#ifdef _GLIBCXX_VECTOR
_T _vo(vector<T> &v){for(T &x:v)out(&x == &v[0]?"":" "),out(x);outl();}
#endif
_HT _vo(H&& h, T&&... t){out(h);out(move(t)...);}
template <typename... T> _vl(T&&... t){out(move(t)...);outl();}

int main() {
	for (int n, m; n = in(), m = in();) {
		vector<int> v(n);
		for (int &x: v)
			x = in();
		sort(v.rbegin(), v.rend());
		int p = 0;
		for (int i = 0; i < n; i++)
			if ((i + 1) % m)
				p += v[i];
		outl(p);
	}
}

#include <iostream>
#include <string>
#include <algorithm>
#include <utility> 
#include <unordered_set>
#include <vector>
#include <list> 
#include <string>
#include <iterator> 
#include <deque>
#include <array>
#include <forward_list>
#include <queue>
#include <stack>
#include <set>
#include <map>
#include <unordered_set>
#include <unordered_map>
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <ctime>
#include <cmath>
#include <climits>
#include <bitset>
#include <numeric>
using namespace std;


const long double PI = 3.14159265358979323846264338327950;
const double EPS = 1e-9;
const int N = 1000000;

template <class T> T gcd(T a, T b) {
	if (b == 0) { return a; }
	return gcd(b, a % b);
}

template <class T> bool isPrime(T x) {
	for (T d = 2; d * d <= x; d++) { if (x % d == 0) return false; }
	return true;
}



int main() {
	ios_base::sync_with_stdio(false);
	cin.tie(NULL);
	cout.tie(NULL);

	int n, m;
	unordered_map<int, int> mp;
	cin >> n;
	for (int i = 0; i < n; ++i) {
		cin >> m;
		++mp[m];
	}

	int ans = 0;
	for (auto it = mp.begin(); it != mp.end(); ++it) {
		if ((it->second) & 1) ++ans;
	}

	cout << ans << '\n';
}
