#include <stdio.h>
int main(void){
	int element,num;
	scanf("%d%d",&element,&num);
	
	int fresh[element];
	for(int i = 0;i < element;i ++){
		scanf("%d",&fresh[i]);
	}
	
	// ソート
	for(int i = 0;i < element;i ++){
		for(int j = 0;j < element;j ++){
			if(fresh[i] > fresh[j]){
				int tmp = fresh[i];
				fresh[i] = fresh[j];
				fresh[j] = tmp;
			}
		}
	}
	
	int ans = 0;
	for(int i = 0;i < num;i ++){
		if(fresh[i] > 0){
			ans += fresh[i];
		}
	}
	if(ans == 0){
		ans = fresh[0];
	}
	printf("%d",ans);
}