#include <iostream>
#include <string> 
#include <vector>
#include <algorithm>
int main()
{
	using namespace std;
	int n, k;
	cin >> n;
	cin >> k;
	cout << n << k;
	vector<int> arr;
	arr.resize(n);
	vector<int> arr_ordered;
	for (int i = 0; i < n; i++)
	{
		cin >> arr[i];
	}
	sort(arr.begin(), arr.end());	

	double avg = 0;
	double avg_tail = 0;
	for (int i = 0; i < k-1; i++)
	{
		avg += arr[i];
	}

	for (int i = k-1; i < n; i++)
	{
		avg_tail += arr[i];
	}

	avg_tail = avg_tail / (n - k + 1);
	avg += avg_tail;
	
	cout << "avg" << avg << endl;
	return avg;
}