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>
using namespace std;

#define REP(i,n) for(int i=0;i<(n);i++)
#define ALL(v) (v).begin(),(v).end()
#define int long long
typedef pair<int,int> P;

//-----------------------------------------------------------------------

int w;
int t[5][10];
vector<int> v[5];

int UpDate(){
    int res=0;
    for(int j=0;j<w;j++){
	for(int l=0;l<3;l++){
	    if(v[l][j]==0) continue;
	    int key=v[l][j],r=l;
	    while(r<5 && v[r][j]==key) r++;
	    if(r-l>=3){
		res+=key*(r-l);
		REP(i,5) if(v[i][j]==key) v[i][j]=0;
	    }
	}
    }
    return res;
}
void Delete(){
    REP(i,5){
	v[i].erase(remove(ALL(v[i]),0),v[i].end());
	while(v[i].size()<w) v[i].push_back(0);
    }
}
signed main()
{
    cin.tie(0);
    ios::sync_with_stdio(false);

    while(cin>>w,w)
    {
	for(int j=w-1;j>=0;j--) REP(i,5){
	    cin>>t[i][j];
	}
	REP(i,5) v[i].clear();
	REP(i,5) REP(j,w){
	    v[i].push_back(t[i][j]);
	}

	int ans=0;
	while(true){
	    int score=UpDate();
	    if(score==0) break;
	    ans+=score;
	    Delete();
	}
	cout<<ans<<endl;
    }
}

C++: #include <iostream>
#include <cmath>
#include <algorithm>
#include <vector>
using namespace std;
using ll = long long;
int field[10][5]={};
int sum=0;
void game(int h){
	int newfield[11][5]={};
	for(int y=0;y<h;y++){
		newfield[y][0]=field[y][0];
		newfield[y][4]=field[y][4];
		for(int x=1;x<4;x++){
			if(field[y][x-1]==field[y][x]&&field[y][x+1]==field[y][x]){
				newfield[y][x-1]-=1000;
				newfield[y][x]-=1000;
				newfield[y][x+1]-=1000;
			}
			else{
				newfield[y][x]+=field[y][x];
			}
		}
		for(int i=0;i<5;i++){
			if(newfield[y][i]<0)	newfield[y][i]=0;
		}
	}
	for(int i=0;i<h;i++){
		for(int y=h-1;y>=0;y--){
			for(int x=0;x<5;x++){
				if(newfield[y][x]==0){
					for(int Y=y;Y>=0;Y--)
						if(Y==0)	newfield[Y][x]=0;
						else{
							newfield[Y][x]=newfield[Y-1][x];
						}
				}
			}
		}
	}
	//cout << endl;
	for(int y=0;y<h;y++){
		//cout << endl;
		for(int x=0;x<5;x++){
			field[y][x] = newfield[y][x];
			//cout << field[y][x] << ' ';
		}
	}
}
int main(void){
	while(1){
		int H,sum=0,sum2=0;
		cin >> H;
		if(!H)	break;
		for(int y=0;y<H;y++){
			for(int x=0;x<5;x++){
				cin >> field[y][x];
				sum+=field[y][x];
			}
		}
		for(int i=0;i<H;i++)	game(H);
		for(int i=0;i<H;i++){
			for(int j=0;j<5;j++)	sum2+=field[i][j];
		}
		cout << sum-sum2 << endl;
	}
	return 0;
}