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 <iostream>
#include <iomanip>
#include <algorithm>
#include <string>
#include <cstdio>
#include <cmath>
#include <cstdlib>
#include <cstring>
#include <vector>
#include <list>
#include <map>
#include <set>
#include <queue>
#include <stack>

using std::cin;
using std::cout;
using std::endl;
using std::setprecision;
using std::fixed;
using std::pair;
using std::make_pair;
using std::string;
using std::vector;
using std::list;
using std::map;
using std::set;
using std::queue;
using std::priority_queue;
using std::stack;

typedef vector<int> VI;
typedef vector<vector<int> > VII;
typedef vector<string> VS;
typedef pair<int, int> PII;

int main(void) {
    int h;
    while (cin >> h) {
        if (h == 0) {
            break; 
        }
        VII table(h, VI(5));
        for (int i = 0; i < h; i++) {
            for (int j = 0; j < 5; j++) {
                cin >> table[i][j];
            }
        }

        int score = 0;
        while (1) {
            bool change = false;
            for (int i = 0; i < h; i++) {
                int j = 0;
                while (j < 3) {
                    int k;
                    for (k = j + 1; k < 5; k++) {
                        if (table[i][k] != table[i][j]) {
                            break;
                        }
                    }
                    if (k - j > 2 && table[i][j] != 0) {
                        score += (k - j) * table[i][j];
                        for (int l = j; l < k; l++) {
                            table[i][l] = 0;  
                        }
                        change = true;
                    }
                    j = k;
                }
            }

            if (! change) {
                break;
            }
            for (int i = h - 1; i > 0; i--) {
                for (int j = 0; j < 5; j++) {
                    if (table[i][j] == 0) {
                        for (int k = i - 1; k >= 0; k--) {
                            if (table[k][j] != 0) {
                                table[i][j] = table[k][j];
                                table[k][j] = 0;
                                break;
                            }
                        }
                    }
                }
            }

        }
        cout << score << endl;
    }
    return 0;
}

C++: #include "bits/stdc++.h"
using namespace std;
typedef long long ll;

int main(){

    int mp[20][10];
    int flg[20][10];

    for(int h; cin >> h, h;){
        for(int y = 0; y < 20; y++){
            for(int x = 0; x < 10; x++){
                mp[y][x] = 0;
            }
        }
        for(int y = h; y >= 1; y--){
            for(int x = 1; x <= 5; x++){
                cin >> mp[y][x];
            }
        }
        int ans = 0;
        for(int f = 1; f;){
            f = 0;
            for(int y = 0; y < 20; y++){
                for(int x = 0; x < 10; x++){
                    flg[y][x] = 0;
                }
            }
            for(int y = 1; y <= h; y++){
                for(int x = 1; x <= 3; x++){
                    if(mp[y][x] == 0)continue;
                    if(mp[y][x] == mp[y][x + 1] && mp[y][x+1] == mp[y][x+2]){
                        flg[y][x] = 1;
                        flg[y][x+1] = 1;
                        flg[y][x+2] = 1;
                    }
                }
            }
            for(int y = 1; y <= h; y++){
                for(int x = 1; x <= 5; x++){
                    if(flg[y][x] == 0)continue;
                    f = 1;
                    ans+=mp[y][x];
                    mp[y][x] = 0;
                }
            }
            for(int x = 1; x <= 5; x++){
                for(int y = 1; y <= h; y++){
                    if(mp[y][x])continue;
                    for(int y2 = y; y2 <= h; y2++){
                        if(mp[y2][x]){
                            swap(mp[y][x], mp[y2][x]);
                            break;
                        }
                    }
                }
            }
            // for(int y = h; y >= 1; y--){
            //     for(int x = 1; x <= 5; x++){
            //         cout << mp[y][x];
            //     }
            //     cout << endl;
            // }
            // cout << endl;
        }
        cout << ans << endl;
    }

    return 0;
}