#include <bits/stdc++.h>
using namespace std;
 
int main() 
{
   int t;
   cin >> t;
   while(t--){
     int n,k;
     cin >> n ;
     cin>>k;
    std::vector<int>vct(n);
    std::vector<int>vct1;
    for(int i=0;i<n;i++)
    {
      cin>>vct[i];
    }
    for(int i=0;i<n-k+1;i++)
    {
      int sum=0;
      for(int j=i;j<i+k;j++)
      {
        sum+=vct[j];
      }
      vct1.push_back(sum);
    }
     sort(vct1.begin(),vct1.end());
     cout<<vct1[vct1.size()-1];
   }
    return 0;
}

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MQo1IDQKMSAzIDUgMiA3

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