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++: //#define __USE_MINGW_ANSI_STDIO 0
#include <bits/stdc++.h>

using namespace std;
typedef long long ll;
typedef vector<int> VI;
typedef vector<VI> VVI;
typedef vector<ll> VL;
typedef vector<VL> VVL;
typedef pair<int, int> PII;

#define FOR(i, a, n) for (ll i = (ll)a; i < (ll)n; ++i)
#define REP(i, n) FOR(i, 0, n)
#define ALL(x) x.begin(), x.end()
#define IN(a, b, x) (a <= x && x < b)
#define MP make_pair
#define PB push_back
#define MOD 1000000007
#define INF (1LL << 30)
#define LLINF (1LL << 60)
#define PI 3.14159265359
#define EPS 1e-12
//#define int ll

int dx[] = {0, 1, 0, -1}, dy[] = {1, 0, -1, 0};

int main() {
  while (true) {
    int h, b[20][10];
    cin >> h;
    if (!h)
      break;
    REP(i, h) REP(j, 5) cin >> b[i][j];

    int ret = 0;
    //?????????????????????h???
    REP(i, h) {
      REP(j, h) {
        int c = 1;
        FOR(k, 1, 5) {
          if (b[j][k] == b[j][k - 1] && b[j][k] != 0)
            c++;
          else {
            if (c >= 3) {
              ret += b[j][k - 1] * c;
              for (int l = k - 1; l >= k - c; --l)
                b[j][l] = -1;
            }
            c = 1;
          }
        }
        if (c >= 3) {
          ret += b[j][4] * c;
          for (int l = 4; l > 4 - c; --l)
            b[j][l] = -1;
        }
      }
      /*cout << "kesu:" << endl;
      REP(i, h) {
        REP(j, 5) {
          cout << b[i][j] << " ";
        }
        cout << endl;
      }*/
      REP(j, 5) {
        int c = 0;
        for (int k = h - 1; k >= 0; --k) {
          if (b[k][j] == -1) {
            c++;
          } else if (c) {
            int ii = 0;
            while (ii != c) {
              b[k + c - ii][j] = b[k][j];
              b[k][j] = 0;
              ++ii;
            }
          }
        }
        if (c) {
          REP(k, c) b[k][j] = 0;
        }
      }
      /*cout << "otosu:" << endl;
      REP(i, h) {
        REP(j, 5) {
          cout << b[i][j] << " ";
        }
        cout << endl;
      }*/
    }

    cout << ret << endl;
  }

  return 0;
}

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

int main(){
    int H;
    while(cin >> H, H!=0){
        int point = 0;
        //??\???
        vector< vector<int> > board(5, vector<int>(H, 0));
        for(int i=H-1; i>=0; i--){
            for(int j=0; j<5; j++){
                cin >> board[j][i];
            }
        }
        //?¶????
        for(;;){
            bool isEnd = true;
            for(int i=0; i<H; i++){
                for(int j=0; j<3; j++){
                    if(board[j][i]==board[j+1][i] && board[j+1][i]==board[j+2][i]){

                        int tmp = board[j][i];
                        if(tmp==0) break;
                        isEnd = false;
                        for(int k=0; j+k<5; k++){
                            if(board[j+k][i]==tmp){
                                point+=tmp;
                                board[j+k][i]=0;
                            }
                        }
                    }
                }
            }
            /*cout << endl;
            for(int i=H-1; i>=0; i--){
                for(int j=0; j<5; j++){
                    cout << board[j][i] << " ";
                }
            cout << endl;
            }*/
            for(int i=0; i<5; i++){
                vector<int>::iterator end = remove(board[i].begin(), board[i].end(), 0);
                for (vector<int>::iterator p=end; p!=board[i].end(); ++p) *p = 0;
            }
            /*cout << endl;
            for(int i=H-1; i>=0; i--){
                for(int j=0; j<5; j++){
                    cout << board[j][i] << " ";
                }
            cout << endl;
            }*/
            if(isEnd) break;
        }
    cout << point << endl;
    }
    return 0;
}