#include<bits/stdc++.h>
using namespace std;
#define int long long
const int N=2e5+10;
int a[N];
signed main()
{
	int n,d,p;cin>>n>>d>>p;
	for(int i=1;i<=n;i++)cin>>a[i];
	sort(a+1,a+n+1,[](int x,int y){return x>y;});
	int ans=0;
	for(int i=1;i<=n;i+=d)
	{
		int sum=0;
		for(int j=i;j<=min(n,i+d-1);j++)sum+=a[j];
		if(sum>p)ans+=p;
		else
		{
			for(int j=i;j<=n;j++)ans+=a[j];
			cout<<ans;
			return 0;
		}
	}
	cout<<ans;
	return 0;
}