#include <stdio.h>

int field[20][20], chk[20][20];
int N, C;


int scsub(int x, int y, int c)
{
  int dx[] = {-1, -1, 0, 0, 1, 1};
  int dy[] = {-1, 0, -1, 1, 0, 1};
  int i, p = 1, dead = 1;;
  if (chk[x][y]) return -1;
  chk[x][y] = 1;
  /*printf("i%d %d\n", x, y);*/
  for (i = 0; i < 6; i++) {
    if (field[x+dx[i]][y+dy[i]] == 0) dead = 0;
    if (field[x+dx[i]][y+dy[i]] == c) {
      int dp = scsub(x+dx[i], y+dy[i], c);
      if (dp == 0) dead = 0;
      if (dp > 0) p += dp;
    }
  }
  return p * dead;
}

int getsc()
{
  int i, j, x, y, sc = 0, dsc;
  for (i = 0; i < 20; i++) 
    for (j = 0; j < 20; j++)
      chk[i][j] = 0;
  
  for (x = 1; x <= N; x++) {
    for (y = 1; y <= x; y++) {
      if (field[x][y] == 0 || chk[x][y]) continue;
      sc += scsub(x, y, field[x][y]) * (field[x][y]==C ? -1 : 1);
      /*printf("%d %d %d\n", x, y, sc);*/
    }
  }
  return sc;
}

int main()
{
  int i, j, k, sc, hisc;
  FILE *fp = fopen("sai.txt", "r");
  
  while (fscanf(fp, "%d%d", &N, &C) == 2) {
    if (N == 0 && C == 0) break;
    for (i = 0; i < 20; i++) 
      for (j = 0; j < 20; j++)
	field[i][j] = 99;
    
    for (i = 1; i <= N; i++) {
      for (j = 1; j <= i; j++) {
	fscanf(fp, "%d", &field[i][j]);
	
      }
    }
    
    hisc = -99999;
    for (i = 1; i <= N; i++) {
      for (j = 1; j <= i; j++) {
	if (field[i][j] == 0) {
	  field[i][j] = C;
	  sc = getsc();
	  if (sc > hisc) hisc = sc;
	  field[i][j] = 0;
	}
      }
    }
    printf("%d\n", hisc);
  }
  return 0;
}