content: package v102;
  import java.io.BufferedReader;
  import java.io.IOException;
  import java.io.InputStream;
  import java.io.InputStreamReader;
  import java.io.PrintWriter;
  import java.util.Arrays;
  import java.util.StringTokenizer;
  
  
  public class HippityHopscotch_UVa10259 {
  
  	static int[][] grid;
  	static int[][] memo;
  	static int N, K;
  	static int[] dx = new int[]{0, 0, -1, 1};
  	static int[] dy = new int[]{-1, 1, 0, 0};
  	
  	static int dfs(int i, int j)
  	{
  		if(memo[i][j] != -1)
  			return memo[i][j];
  		
  		int val = 0;
  		for(int k = 0; k < 4; k++)
  			for(int f = 1; f <= K; f++)
  			{
  				int x = i + dx[k] * f;
  				int y = j + dy[k] * f;
  				if(!valid(x, y))
  					break;
  				if(grid[x][y] > grid[i][j])
  					val = Math.max(val, dfs(x, y));
  			}
  		return memo[i][j] = val + grid[i][j];
  	}
  	
  	static boolean valid(int i, int j)
  	{
  		if(i < 0 || j < 0 || i >= N || j >= N)
  			return false;
  		return true;
  	}
  	public static void main(String[] args) throws IOException 
  	{
  		
  		Scanner sc = new Scanner(System.in);
  		PrintWriter out = new PrintWriter(System.out);
  		int tc = sc.nextInt();
  		while(tc-->0)
  		{
  			N = sc.nextInt();
  			K = sc.nextInt();
  			grid = new int[N][N];
  			memo = new int[N][N];
  			for(int i = 0; i < N; i++)
  			{
  				Arrays.fill(memo[i], -1);
  				for(int j = 0; j < N; j++)
  					grid[i][j] = sc.nextInt();
  			}
  				
  			
  			out.println(dfs(0, 0));
  			if(tc != 0)
  				out.println();
  		}
  		out.flush();
  	}	
  	
  	static class Scanner 
  	{
  		StringTokenizer st;
  		BufferedReader br;
  
  		public Scanner(InputStream s){	br = new BufferedReader(new InputStreamReader(s));}
  
  		public String next() throws IOException 
  		{
  			while (st == null || !st.hasMoreTokens()) 
  				st = new StringTokenizer(br.readLine());
  			return st.nextToken();
  		}
  
  		public int nextInt() throws IOException {return Integer.parseInt(next());}
  		
  		public long nextLong() throws IOException {return Long.parseLong(next());}
  
  		public String nextLine() throws IOException {return br.readLine();}
  		
  		public double nextDouble() throws IOException
  		{
  			String x = next();
  			StringBuilder sb = new StringBuilder("0");
  			double res = 0, f = 1;
  			boolean dec = false, neg = false;
  			int start = 0;
  			if(x.charAt(0) == '-')
  			{
  				neg = true;
  				start++;
  			}
  			for(int i = start; i < x.length(); i++)
  				if(x.charAt(i) == '.')
  				{
  					res = Long.parseLong(sb.toString());
  					sb = new StringBuilder("0");
  					dec = true;
  				}
  				else
  				{
  					sb.append(x.charAt(i));
  					if(dec)
  						f *= 10;
  				}
  			res += Long.parseLong(sb.toString()) / f;
  			return res * (neg?-1:1);
  		}
  		
  		public boolean ready() throws IOException {return br.ready();}
  
  
  	}
  }
  