source_code: import java.util.*;
  import java.io.*;
  import java.text.*;
  public class Main{
      //SOLUTION BEGIN
      //Into the Hardware Mode
      void pre() throws Exception{}
      void solve(int TC)throws Exception{
          int n = ni(), m = ni();
          long[][] a = new long[n][m];
          long[] col = new long[m];
          for(int i = 0; i< n; i++){
              for(int j = 0; j< m; j++){
                  a[i][j] = nl();
                  col[j] = Math.max(a[i][j], col[j]);
              }
          }
          Integer[] p = new Integer[m];
          for(int i = 0; i< m; i++)p[i] = i;
          Arrays.sort(p, (Integer i1, Integer i2) -> Long.compare(col[i2], col[i1]));
          long[][] mat = new long[n][Math.min(m, 6)];
          for(int i = 0; i< Math.min(m, 6); i++){
              for(int j = 0; j< n; j++)mat[j][i] = a[j][p[i]];
          }
          long pow = 1;
          for(int i = 0; i< Math.min(m, 6); i++)pow *= n;
          int[] sh = new int[Math.min(m, 6)];
          long ans = 0;
          for(int i = 0; i< pow; i++){
              int x = i;
              for(int j = 0; j< Math.min(m, 6); j++){
                  sh[j] = x%n;
                  x/=n;
              }
              long cur = 0;
              for(int ro = 0; ro < n; ro++){
                  long cR = 0;
                  for(int j = 0; j < Math.min(m, 6); j++)cR = Math.max(cR, mat[(ro+sh[j])%n][j]);
                  cur += cR;
              }
              ans = Math.max(ans, cur);
          }
          pn(ans);
      }
      //SOLUTION END
      void hold(boolean b)throws Exception{if(!b)throw new Exception("Hold right there, Sparky!");}
      void exit(boolean b){if(!b)System.exit(0);}
      long IINF = (long)1e18, mod = (long)1e9+7;
      final int INF = (int)1e9, MX = (int)2e6+5;
      DecimalFormat df = new DecimalFormat("0.00000000");
      double PI = 3.141592653589793238462643383279502884197169399, eps = 1e-6;
      static boolean multipleTC = true, memory = false, fileIO = false;
      FastReader in;PrintWriter out;
      void run() throws Exception{
          if(fileIO){
              in = new FastReader("input.txt");
              out = new PrintWriter("output.txt");
          }else {
              in = new FastReader();
              out = new PrintWriter(System.out);
          }
          //Solution Credits: Taranpreet Singh
          int T = (multipleTC)?ni():1;
          pre();
          for(int t = 1; t<= T; t++)solve(t);
          out.flush();
          out.close();
      }
      public static void main(String[] args) throws Exception{
          if(memory)new Thread(null, new Runnable() {public void run(){try{new Main().run();}catch(Exception e){e.printStackTrace();}}}, "1", 1 << 28).start();
          else new Main().run();
      }
      
      int digit(long s){int ans = 0;while(s>0){s/=10;ans++;}return ans;}
      long gcd(long a, long b){return (b==0)?a:gcd(b,a%b);}
      int gcd(int a, int b){return (b==0)?a:gcd(b,a%b);}
      int bit(long n){return (n==0)?0:(1+bit(n&(n-1)));}
      void p(Object o){out.print(o);}
      void pn(Object o){out.println(o);}
      void pni(Object o){out.println(o);out.flush();}
      String n()throws Exception{return in.next();}
      String nln()throws Exception{return in.nextLine();}
      int ni()throws Exception{return Integer.parseInt(in.next());}
      long nl()throws Exception{return Long.parseLong(in.next());}
      double nd()throws Exception{return Double.parseDouble(in.next());}
   
      class FastReader{
          BufferedReader br;
          StringTokenizer st;
          public FastReader(){
              br = new BufferedReader(new InputStreamReader(System.in));
          }
   
          public FastReader(String s) throws Exception{
              br = new BufferedReader(new FileReader(s));
          }
   
          String next() throws Exception{
              while (st == null || !st.hasMoreElements()){
                  try{
                      st = new StringTokenizer(br.readLine());
                  }catch (IOException  e){
                      throw new Exception(e.toString());
                  }
              }
              return st.nextToken();
          }
   
          String nextLine() throws Exception{
              String str = "";
              try{   
                  str = br.readLine();
              }catch (IOException e){
                  throw new Exception(e.toString());
              }  
              return str;
          }
      }
  }