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;

int main(){
    int h;
    cin >> h;
    bool flag;
    int left;
    int right;
    int ans;
    while (h!=0){
        vector<vector<int>> color(h, vector<int>(5));
        for (int i = 0; i<h; i++){
            for (int j = 0; j<5; j++) cin >> color[i][j];
        }
        ans = 0;
        while (1){
            flag = false;
            for (int i = 0; i<h; i++){
                left = 2;
                right = 2;
                for (int j = 1; j<3; j++){
                    if (color[i][2]!=0 && color[i][2]==color[i][2+j]) right++;
                    else break;
                }
                for (int j = 1; j<3; j++){
                    if (color[i][2]!=0 && color[i][2]==color[i][2-j]) left--;
                    else break;
                }
                if (right - left >= 2){
                    flag = true;
                    ans += color[i][2]*(right - left + 1);
                    for (int j = left; j <= right; j++) color[i][j] = 0;
                }
            }
            if (!flag) break;
            for (int i = 0; i<5; i++){
                for (int j = h-1; j>=0; j--){
                    if (j+1 < h && color[j+1][i]==0 && color[j][i]!=0){
                        color[j+1][i] = color[j][i];
                        color[j][i] = 0;
                        j+=2;
                    }
                }
            }
        }
        cout << ans << endl;
        cin >> h;
    }
}

C++: #include <bits/stdc++.h>
using namespace std;

#define DUMP(x) cerr << #x << "=" << x << endl
#define DUMP2(x, y) cerr<<"("<<#x<<", "<<#y<<") = ("<<x<<", "<<y<<")"<< endl
#define BINARY(x) static_cast<bitset<16> >(x)

#define rep(i,n) for(int i=0;i<(int)(n);i++)
#define REP(i,m,n) for (int i=m;i<(int)(n);i++)

#define in_range(x, y, w, h) (0<=(int)(x) && (int)(x)<(int)(w) && 0<=(int)(y) && (int)(y)<(int)(h))
#define ALL(a) (a).begin(),(a).end()

typedef long long ll;
const int INF   = 1e9;
const ll  INFLL = 1e18;
typedef pair<int, int> PII;
typedef vector<vector<int>> Graph;
int dx[4]={0, -1, 1, 0}, dy[4]={-1, 0, 0, 1};

int H, W = 5; 

int erase(vector<vector<int>> &board)
{
    int res = 0;

    for (int y=0; y<H; y++) {
        for (int x=0; x<W; x++) {
            if (board[y][x] == -1) continue;

            int cnt = 1;
            for (int xx=x+1; xx<W; xx++) {
                if (board[y][x] != board[y][xx]) break;
                else cnt++;
            }

            if (cnt >= 3) {
                res += cnt * board[y][x];
                for (int i=0; i<cnt; i++) {
                    board[y][x+i] = -1;
                }
            }

        }
    }
    return res;
}

bool drop(vector<vector<int>> &board)
{
    bool res = false;
    for (int x=0; x<W; x++) {
        for (int y=H-2; y>=0; y--) {
            int yy = y;
            while (yy < H-1 && board[yy][x] > 0 && board[yy+1][x] == -1) {
                swap(board[yy+1][x], board[yy][x]);
                yy++;
                res = true;
            }
        }
    }
    return res;
}

void dump(vector<vector<int>> board)
{
    cerr << "-------------" << endl;
    rep(y, H) {
        rep(x, W) {
            cout << board[y][x] << " ";
        }
        cout << endl;
    }
}

int main()
{
    ios::sync_with_stdio(false);

    while (cin >> H, H) {
        vector<vector<int>> board(H, vector<int>(W, 0));
        rep(y, H) rep(x, W) cin >> board[y][x];

        int score = 0;
        bool updated = true;
        while (updated) {
#ifdef DEBUG
            dump(board);
#endif

            updated = false;

            score += erase(board);
            updated = drop(board);

            if (!updated) break;
        }
#ifdef DEBUG
        dump(board);
#endif
        cout << score << endl;
    }
}