#include <cstdio>
#include <iostream>
#include <complex>
#include <vector>
#include <utility>
#include <algorithm>
#include <cassert>
#include <queue>
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <map>
using namespace std;
 
#define rep(i, n) for (int i = 0; i < (int)(n); i++)
 
const int W = 5;
int H;
int fld[20][10];
 
int main() {
  for (;;) {
    scanf("%d", &H);
    if (H == 0) return 0;
    rep (y, H) rep (x, W) scanf("%d", &fld[y][x]);
 
    int ans = 0;
    for (;;) {
      int tmp = 0;
 
      rep (y, H) {
        for (int x1 = 0; x1 < W; ++x1) {
          if (fld[y][x1] == -1) continue;
 
          int x2;
          for (x2 = x1 + 1; x2 < W; ++x2) {
            if (fld[y][x1] != fld[y][x2]) break;
          }
          if (x2 - x1 < 3) continue;
 
          tmp += fld[y][x1] * (x2 - x1);
          for (int x = x1; x < x2; ++x) fld[y][x] = -1;
        }
      }
 
      rep (x, W) {
        int y2 = H - 1;
        for (int y = H - 1; y >= 0; --y) {
          while (y2 >= 0 && fld[y2][x] == -1) --y2;
          if (y2 < 0) continue;
 
          fld[y][x] = fld[y2][x];
          if (y2 != y) fld[y2][x] = -1;
          --y2;
        }
      }
 
      if (tmp == 0) break;
      ans += tmp;
    }
    printf("%d\n", 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