import java.util.*;
public class Main {
  private static final int W = 5;
  public static void main(String[] args) {
    final Scanner sc = new Scanner(System.in);
    while(sc.hasNext()) {
      final int H = sc.nextInt();
      if(H == 0)
        return;
      final int[][] css = new int[H][W];
      for(int i = 0; i < H; i++)
        for(int j = 0; j < W; j++)
          css[i][j] = sc.nextInt();
      int ans = 0;
      boolean flag = true;
      while(flag) {
System.err.println("@@@");
for(int i = 0; i < H; i++) {
  for(int j = 0; j < W; j++)
    System.err.print(css[i][j]);
  System.err.println();
}
        flag = false;
        for(int i = 0; i < H; i++)
          for(int j = 0; j < W - 2; j++)
            if(css[i][j] > 0 && css[i][j+1] == css[i][j] && css[i][j+2] == css[i][j]){
              final int c = css[i][j];
              css[i][j] = css[i][j + 1] = css[i][j + 2] = 0;
              ans += 3 * c;
              j += 3;
              flag = true;
              while(j < W && css[i][j] == c) {
                css[i][j] = 0;
                ans += c;
                j++;
              }
            }
System.err.println("***");
for(int i = 0; i < H; i++) {
  for(int j = 0; j < W; j++)
    System.err.print(css[i][j]);
  System.err.println();
}
        for(int j = 0; j < W; j++) {
          int k = H - 1;
          for(int i = H - 1; i >= 0; i--)
             if(css[i][j] > 0)
               css[k--][j] = css[i][j];
          while(k >= 0)
            css[k--][j] = 0;
        }
      }
      System.out.println(ans);
    }
  }
}
 

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1
6 9 9 9 9
5
5 9 5 5 9
5 5 6 9 9
4 6 3 6 9
3 3 2 9 9
2 2 1 1 1
10
3 5 6 5 6
2 2 2 8 3
6 2 5 9 2
7 7 7 6 1
4 6 6 4 9
8 9 1 1 8
5 6 1 8 1
6 8 2 1 2
9 6 3 3 5
5 3 8 8 8
5
1 2 3 4 5
6 7 8 9 1
2 3 4 5 6
7 8 9 1 2
3 4 5 6 7
3
2 2 8 7 4
6 5 7 7 7
8 8 9 9 9
0