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 n ;
vector<vector<int> > d;

void Erase () {
    for (int i = 0; i < 5; i++) {
        for (int j = n - 1; j >= 0; j--) {
            if (d[j][i] == 0) {
                int k = j;
                bool flag = true;
                while (k >= 0 && d[k][i] == 0) {
                    k--;
                    if (k < 0) flag = false;
                    break;
                }
                if (flag) {
                    d[j][i] = d[k][i];
                    d[k][i] = 0;
                }
            }
        }
    }
}

int Check () {
    int ret = 0;
    for (int i = 0; i < n; i++) {
        for (int j = 0; j < 5; j++) {
            int count = 0;
            int num = d[i][j];
            int k = j;
            while (num != 0 && d[i][k] == num) {
                count++;
                k++;
            }

            if (count >= 3) {
                ret += count * num;
                while (k> j) {
                    k--;
                    d[i][k] = 0;
                }

                break;
            }
        }
    }

    return ret;
}

int main ()
{
    while (cin >> n, n) {
        d.clear();
        d.resize(n, vector<int>(5));
        for (auto &i : d)
            for (auto &j : i) cin >> j;

        int num = 1;
        int res = 0;
        while (num > 0) {
            Erase();
            num = Check();
            Erase();
            res += num;
        }

        cout << res << endl;
    }

    return 0;
}

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 namespace std;

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

//global
int h;

// func
int del(VVI &table) {
    int score = 0;
    for (int i = 0; i < h; i++) {
        for (int start = 0; start < 3; start++) {
            int diff = 0;
            for (int end = start; end < 4; end++) {
                if (table[i][start] != table[i][end + 1]) {
                    break;
                } 
                diff++;
            }
            if (diff >= 2) {
                score += (diff + 1) * table[i][start];
                for (int j = 0; j <= diff; j++) {
                    table[i][start + j] = 0;
                }
            }
            start += diff;
        }
    }
    return score;
}

void drop(VVI &table) {
    VVI new_table(h, VI(5, 0));
    for (int j = 0; j < 5; j++) {
        int index = h - 1;
        for (int i = h - 1; i >= 0; i--) {
            if (table[i][j] != 0) {
                new_table[index][j] = table[i][j];
                index--;
            }
        }
    }
    table = new_table;
    return;
}

int main(void) {
    while(true) {
        cin >> h;
        if (h == 0) {
            break;
        }
        VVI 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(true) {
            //delete and score
            int new_score = del(table);
            if (new_score == 0) {
                break;
            } else {
                score += new_score;
            }
            //drop
            drop(table);
        }
        cout << score << endl;
    }
    return 0;
}