Go: package main

import (
	"bufio"
	"fmt"
	"os"
	"strconv"
	"strings"
)

func main() {
	io := NewIo()
	defer io.Flush()
	for {
		h := io.NextInt()
		if h == 0 {
			break
		}
		p := make([][]int, h)
		for i := 0; i < h; i++ {
			p[i] = make([]int, 5)
			for j := 0; j < 5; j++ {
				p[i][j] = io.NextInt()
			}
		}
		ans := 0
		for {
			sc := puyo(p, h)
			if sc == 0 {
				break
			}
			fall(p, h)
			ans += sc
		}
		io.Println(ans)
	}
}

func puyo(p [][]int, h int) int {
	sc := 0
	for i := 0; i < h; i++ {
		for j := 0; j < 3; j++ {
			var cnt int
			for cnt = 1; j+cnt < 5; cnt++ {
				if p[i][j] != p[i][j+cnt] {
					break
				}
			}
			if cnt > 2 {
				sc += p[i][j]*cnt
				for k := 0; k < cnt; k++ {
					p[i][j+k] = 0
				}
			}
		}
	}
	return sc
}

func fall(p [][]int, h int) {
	for j := 0; j < 5; j++ {
		for k := 1; k < h; k++ {
			for i := h - 1; i >= k; i-- {
				if p[i][j] == 0 {
					p[i][j] = p[i-1][j]
					p[i-1][j] = 0
				}
			}
		}
	}
}

// I/O template
type Io struct {
	reader    *bufio.Reader
	writer    *bufio.Writer
	tokens    []string
	nextToken int
}

func NewIo() *Io {
	return &Io{
		reader: bufio.NewReader(os.Stdin),
		writer: bufio.NewWriter(os.Stdout),
	}
}

func (io *Io) Flush() {
	err := io.writer.Flush()
	if err != nil {
		panic(err)
	}
}

func (io *Io) NextLine() string {
	var buff []byte
	for {
		line, isPrefix, err := io.reader.ReadLine()
		if err != nil {
			panic(err)
		}
		buff = append(buff, line...)
		if !isPrefix {
			break
		}
	}
	return string(buff)
}

func (io *Io) Next() string {
	for io.nextToken >= len(io.tokens) {
		line := io.NextLine()
		io.tokens = strings.Fields(line)
		io.nextToken = 0
	}
	s := io.tokens[io.nextToken]
	io.nextToken++
	return s
}

func (io *Io) NextInt() int {
	i, err := strconv.Atoi(io.Next())
	if err != nil {
		panic(err)
	}
	return i
}

func (io *Io) NextFloat() float64 {
	i, err := strconv.ParseFloat(io.Next(), 64)
	if err != nil {
		panic(err)
	}
	return i
}

func (io *Io) Println(a ...interface{}) {
	fmt.Fprintln(io.writer, a...)
}

func (io *Io) Printf(format string, a ...interface{}) {
	fmt.Fprintf(io.writer, format, a...)
}

func (io *Io) PrintIntSlice(a []int) {
	b := []interface{}{}
	for _, x := range a {
		b = append(b, x)
	}
	io.Println(b...)
}

func (io *Io) PrintStringSlice(a []string) {
	b := []interface{}{}
	for _, x := range a {
		b = append(b, x)
	}
	io.Println(b...)
}

func Log(name string, value interface{}) {
	fmt.Fprintf(os.Stderr, "%s=%+v\n", name, value)
}

func ExampleIo() {
	io := NewIo()
	defer io.Flush()
	a := make([]int, 0, 3)
	a[0], a[1], a[2] = io.NextInt(), io.NextInt(), io.NextInt()
	io.Println(a)
	io.PrintIntSlice(a)
	Log("io", a)
}

C++: #include <bits/stdc++.h>
#define REP(a,b,c) for(int a=b; a<(int)c; a++)
#define REPD(a,b,c) for(int a=b; a>=(int)c; a--)
#define rep(a,b) REP(a,0,b)
#define repd(a,b) REPD(a,b,0)
typedef long long int ll;
using namespace std;

void show(int data[][5], int H){
  rep(i,H){
    rep(j,5){
      cout << data[i][j];
    }
    cout << endl;
  }  
}

int main(){
  int H;
  while(true){
    cin >> H;
    if(H == 0) break;
    vector<vector<int> > data(H,vector<int>(5, -1));
    rep(i,H) rep(j,5){
      cin >> data[i][j];
    }
    int ans = 0;

    while(true){
      bool finish_flag = true;
      // show(data,H);
      //cout << endl;
      rep(i,H){
        int cnt = 1, idx = 0, eidx = 0;
        REP(j,1,5){
          eidx = j;
          if(data[i][j] == data[i][idx] && data[i][j] != -1){
            cnt++;
          }else{
            if(cnt >= 3){
              break;
            }
            cnt = 1; idx = j;
          }
        }
        if(cnt >= 3){
          finish_flag = false;
          ans += cnt*data[i][idx];
          REP(j,idx,eidx+1){
            data[i][j] = -1;
          }
        }
      }
      //      show(data,H);
      //cout << endl;
      for(int i=H-1; i>=0; i--){
        rep(j,5){
          if(data[i][j] == -1){
            for(int k=i-1; k>=0; k--){
              if(data[k][j] != -1){
                data[i][j] = data[k][j];
                data[k][j] = -1;
                break;
              }
            }
          }
        }
      }
      if(finish_flag) break;
    }
    cout << ans << endl;
  }
  return 0;
}

C++: #include <iostream>
#include <stdio.h>

using namespace std;

int remove(int row[5])
{
    int i;
    int start_num = row[0];
    int len = 1;
    for (i = 1; i < 5; i++)
    {
        if (row[i] == start_num) { len++; }
        else {
            if (len >= 3) { break; }
            else { start_num = row[i]; len = 1; }
        }
    }
    int pt = 0, ct = 0;
    if (len >= 3) {
        pt = row[i - len];
        while (len-- > 0)
        {
            row[i - len - 1] = 0;
            ct++;
        }
        pt *= ct;
    }
    return pt;
}

void drop(int row[10][5], int h)
{
    for (int x = 0; x < 5; x++)
    {
        for (int y = h - 1; y > 0; )
        {
            if (row[y][x] == 0)
            {
                bool flag = false;
                for (int i = y; i > 0; i--)
                {
                    row[i][x] = row[i - 1][x];
                    if (row[i][x] != 0)
                    {
                        flag = true;
                    }
                }
                row[0][x] = 0;
                if (flag == false)
                {
                    break;
                }
            }
            else
            {
                y--;
            }
        }
    }
}

int calc(int row[10][5], int h)
{
    int pt = 0;

    while (true)
    {
        int tmp = 0;
        for (int i = 0; i < h; i++)
        {
            tmp += remove(row[i]);
        }
        drop(row, h);
        if (tmp == 0)
        {
            break;
        }
        pt += tmp;
    }
    return pt;
}

int main(void)
{
    int H;

    while (cin >> H, H)
    {
        int row[10][5];
        for (int i = 0; i < H; i++)
        {
            cin >> row[i][0] >> row[i][1] >> row[i][2] >> row[i][3] >> row[i][4];
        }

        int ans = calc(row, H);
        cout << ans << endl;
    }

    return 0;
}