#include <stdio.h>
#include <string.h>
#include <algorithm>
using namespace std;

int n,k,dp[105][105],a[105][105];
int to[4][2] = {1,0,-1,0,0,1,0,-1};

int check(int x,int y)
{
if(x<1 || y<1 || x>n || y>n)
return 1;
return 0;
}

int dfs(int x,int y)
{
int i,j,l,ans = 0;
if(!dp[x][y])
{
for(i = 1; i<=k; i++)
{
for(j = 0; j<4; j++)
{
int xx = x+to[j][0]*i;
int yy = y+to[j][1]*i;
if(check(xx,yy))
continue;
if(a[xx][yy]>a[x][y])
ans = max(ans,dfs(xx,yy));
}
}
dp[x][y] = ans+a[x][y];
}
return dp[x][y];
}

int main()
{
int i,j;
while(~scanf("%d%d",&n,&k),n>0&&k>0)
{
for(i = 1; i<=n; i++)
for(j = 1; j<=n; j++)
scanf("%d",&a[i][j]);
memset(dp,0,sizeof(dp));
printf("%d\n",dfs(1,1));
}

return 0;
}

hdu1078