#include <stdio.h>

int main(){
   int val,quantity;
   scanf("%d%d",&val,&quantity);
   
   int fresh[val];
   for(int i = 0;i < val;i ++){
   	scanf("%d",&fresh[i]);
   }
   
   for(int i = 0;i < val;i ++){
		for(int j = 0;j < val;j ++){
			if(fresh[i] > fresh[j]){
				int temp = fresh[i];
				fresh[i] = fresh[j];
				fresh[j] = temp;
			}
		}
    }

	int ans = 0;
	for(int i = 0;i < quantity;i ++){
		//printf("新鮮さ:%d ans:%d",fresh[i]);
		if(fresh[i] > 0){
			ans += fresh[i];
		}
	}
	
	if(ans == 0){
		printf("%d",fresh[0]);
	}else{
		printf("%d",ans);	
	}
}