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<algorithm>
#include<vector>
#include<numeric>
#include<string>
#include<cmath>
#include<set>
#include<queue>
#include<bitset>
#include<iomanip>
#include<cctype>

#define rep(i,n) for(int (i)=0;(i)<(n);(i)++)
#define rep2(i,a,b) for (int (i)=a;(i)<(b);(i)++)
#define all(x) (x).begin(),(x).end()

using namespace std;
const int inf = 1001001000;

void print(vector<vector<int>> a){
	for (int i=0;i<a.size();i++){
		for (int j=0;j<a[i].size();j++){
			cout << a[i][j] << " ";
		}
		cout << endl;
	}
}

void print(vector<vector<long long int>> a){
	for (int i=0;i<a.size();i++){
		for (int j=0;j<a[i].size();j++){
			cout << a[i][j] << " ";
		}
		cout << endl;
	}
}

void print(vector<int> a){
    int n = a.size();
    for (int j=0;j<n;j++) {
        if (j != n-1) cout << a[j] << " ";
        else cout << a[j] << endl;
    }
}




void func(int H){
	int table[H][5];

	for(int i = 0; i < H; i++){
		for(int k = 0; k < 5; k++)scanf("%d",&table[i][k]);
	}

	bool FLG;
	int count = 0;

	while(true){

		FLG = false;

		for(int i = 0; i < H; i++){
			for(int k = 0,p = 0; k <= 2; k++){
				if(table[i][k] == -1)continue;
				for(p = 1; k+p < 5 && table[i][k+p] == table[i][k]; p++);
				if(p >= 3){
					for(int a = k; a < k+p; a++){
						count += table[i][a];
						table[i][a] = -1;
						FLG = true;
					}
					break;
				}
			}
		}

		for(int col = 0; col < 5; col++){
			for(int row = H-2,i = 0; row >= 0; row--){
				if(table[row][col] != -1){
					for(i = row+1; i < H && table[i][col] == -1; i++);
					if(i > row+1){
						table[i-1][col] = table[row][col];
						table[row][col] = -1;
					}
				}
			}
		}

		if(!FLG)break;
	}

	printf("%d\n",count);
}


int main(){

	int H;

	while(true){
		scanf("%d",&H);
		if(H == 0)break;

		func(H);
	}

    return 0;
}

C++: #include <iostream>
#include <vector>
using namespace std;

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

    int H;
    while (cin >> H, H) {
        vector<vector<int>> field(H, vector<int>(6, -1));

        for (int y = 0; y < H; ++y) {
            for (int x = 0; x < 5; ++x) {
                cin >> field[y][x];
            }
        }

        int score = 0;
        for (;;) {
            vector<vector<bool>> deleted(H, vector<bool>(6));
            bool done = true;

            for (int y = 0; y < H; ++y) {
                int run = 1;
                for (int x = 1; x < 6; ++x) {
                    if (field[y][x] == field[y][x-1]) {
                        ++run;
                    } else {
                        if (field[y][x-1] != 0 && run >= 3) {
                            score += field[y][x-1] * run;
                            done = false;
                            for (int k = 1; k <= run; ++k)
                                deleted[y][x-k] = true;
                        }
                        run = 1;
                    }
                }
            }

            for (int x = 0; x < 5; ++x) {
                int p = H-1;
                for (int y = H-1; y >= 0; --y) {
                    if (!deleted[y][x]) {
                        field[p][x] = field[y][x];
                        --p;
                    }
                }
                for ( ; p >= 0; --p)
                    field[p][x] = 0;
            }

            if (done)
                break;
        }

        cout << score << endl;
    }
}