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 <vector>
#include <algorithm>
using namespace std;
int main(){
  int H;
  //?????????????????¶????????\???
  while (cin >> H && H>0) {
    vector< vector<int> > c(5,vector<int>(H));
    int sum = 0;
    for (int i=H-1; i>=0; i--){
      for (int j=0; j<5; j++){
	cin >> c[j][i];
      }
    }
    //????????°??????3?????\????¨???????????????´???????????°????¨??????????0?????????
    int flg = 1; //?¶?????????¨???flg == 1
    while (flg) { 
      flg = 0;
      for (int i=H-1; i>=0; i--){
	for (int j=0; j<3; j++) {
	   int cnt = 1; //?¨???????????????°
	  if (c[j][i] != 0) {
	    int flag = 1;
	    for (int k=j+1; k<5 && flag; k++) { //????¨??????????????????????
	      if (c[j][i] == c[k][i])
		cnt++;
	      if (c[j][i] != c[k][i] || k == 4) { //?????????????????£???????????????????????????
		flag = 0;
		if (cnt >= 3) { //3?????\???????????§?????¨???
		  sum += c[j][i] * cnt; //????????????
		  for (int l=j; l<=j+cnt-1; l++) { //0???????????????
		    c[l][i] = 0;
		  }
		  flg = 1;
		}
	      }
	    }
	  }
	}
      }
      for (int j=0; j<5; j++) {
	vector<int>::iterator itr = remove(c[j].begin(), c[j].end(), 0);
	for (; itr != c[j].end(); itr++) *itr = 0;
      }
    }
    //???????????????????????????0????????£??????flg==0??¨?????????????????±???
    cout << sum << endl;
  }
}

C++: #include <bits/stdc++.h>

#define rep(i,n) for(int i=0;i<(int)(n);i++)
#define ITR(x,c) for(__typeof(c.begin()) x=c.begin();x!=c.end();x++)
#define RITR(x,c) for(__typeof(c.rbegin()) x=c.rbegin();x!=c.rend();x++)
#define setp(n) fixed << setprecision(n)

#define lf double
#define ll long long
#define vll vector<ll>
#define vi vector<int>
#define pll pair<ll,ll>
#define pi pair<int,int>

#define all(a) (a.begin()),(a.end())
#define rall(a) (a.rbegin()),(a.rend())
#define fi first
#define se second
#define pb push_back
#define mp make_pair
#define ins insert

using namespace std;

int main(void)
{
	cin.tie(0);
	ios::sync_with_stdio(false);
	
	ll h;
	while(cin>>h, h!=0){
		vector<vll> field(5, vll(h));
		for(int i=h-1; i>=0; i--)rep(j, 5)
			cin >> field[j][i];

		ll ans=0;
		bool loop = true;
		while(loop){
			loop = false;
			for(int i=h-1; i>=0; i--){
				ll left=0, right=0;
				rep(j, 4){
					if (i>=field[j].size() || i>=field[j+1].size()){
						if (right-left>=2) break;
						left=j+1;
						continue;
					}
					if (field[j][i]==field[j+1][i]) right=j+1;
					if (field[j][i]!=field[j+1][i]){
						if (right-left>=2) break;
						left=j+1;
					}
					if (right-left>=2) loop = true;
				}
				if (right-left>=2){
					for(int k=left; k<=right; k++){
						ans += field[k][i];
						field[k].erase(field[k].begin()+i);
					}
				}
			}
		}
		cout << ans << "\n";
	}
	return 0;
}