#include <iostream>
#include <vector>
#include <algorithm>
#include <cstdlib>
#include <ctime>
#include <functional>
#include <bits/stdc++.h> 
 
int main() {
 
	int n;
	std::cin>>n;
 
	int m;
	std::cin>>m;
 
	double v[n] ;
	double k ;
	for (int i =0; i< n; ++i) {
		std::cin>>k;
		v[i] = k;
	}
 
	int l = sizeof(v)/sizeof(v[0]); 
 
    std::sort(v, v+l); 
    double sum = 0.0;
 
	for(int i = n-m; i < n; ++i){
		sum += v[i];
	}
 
	std::cout << sum;
	return 0;
}

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6 4
1.0 2.5 2.5 7.0 2.0 3.0