#include <cstdio>
#include <iostream>
#include <algorithm>
using namespace std;
int t,n,m,i,j,ans,a[100];
int main()
{
scanf("%d",&t);
for(j=0;j<t;j++)
{ ans=0;
scanf("%d %d",&n,&m);
for(i=0;i<n;i++)
scanf("%d",&a[i]);
sort(a,a+n);
for(i=0;i<n;i++)
{
if(a[i]<0 && m>0)
{
ans+=(a[i]*-1);
m--;
}
}
printf("%d\n",ans);
}
return 0;
}
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