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<string>
#include<cstdio>
using namespace std;

string str;

int main()
{
  int h;
  int a[11][5];
  int i,j;
  int k;
  int z=0;

  while(1){
  cin>>h;
  // cout<<'H'<<h<<endl;
  z=0;
  if(h==0)break;
  int sum=0;
  for(i=0;i<h;i++)
    scanf("%d %d %d %d %d", &a[i][0],&a[i][1],&a[i][2],&a[i][3],&a[i][4]);

  if(h==1){


     for(j=0;j<3;j++){

	if(a[i-1][j]==a[i-1][j+1]){
	  if(a[i-1][j+1]==a[i-1][j+2]){//3??£??\???

	    if(j+2==4){//3??£?????¨???
	      sum+=a[i-1][j]*3;
	      a[i-1][j]=a[i-1][j+1]=a[i-1][j+2]=0;
	      z=1;
	      break;
	    }//end3

	    if(a[i-1][j+2]==a[i-1][j+3]){//4??£??\???
	      if(j+3==4){//4??£?????¨???
		sum+=a[i-1][j]*4;
		a[i-1][j]=a[i-1][j+1]=a[i-1][j+2]=a[i-1][j+3]=0;
		z=1;
		break;
	      }//end4

	      if(a[i-1][j+3]==a[i-1][j+4]){//5??£?????¨???
		sum+=a[i-1][j]*5;
		z=1;	     
		break;
	      }//end5

	      sum+=a[i-1][j]*4;;
	      a[i-1][j]=a[i-1][j+1]=a[i-1][j+2]=a[i-1][j+3]=0;
	      z=1;
	      break;
	    }//end4over

	    sum+=a[i-1][j]*3;
	    a[i-1][j]=a[i-1][j+1]=a[i-1][j+2]=0;
	    z=1;	 
	    break;
	  }//end3over
	}//?????¢?´¢??????
      }
     z=0;
     cout<<sum<<endl;
  }else{

  while(1){
  //???????¶???????????????????????????????
    for(i=h;i>0;i--){
      for(j=0;j<3;j++){

	if(a[i-1][j]==a[i-1][j+1]){
	  if(a[i-1][j+1]==a[i-1][j+2]){//3??£??\???

	    if(j+2==4){//3??£?????¨???
	      sum+=a[i-1][j]*3;
	      a[i-1][j]=a[i-1][j+1]=a[i-1][j+2]=0;
	      z=1;
	      break;
	    }//end3

	    if(a[i-1][j+2]==a[i-1][j+3]){//4??£??\???
	      if(j+3==4){//4??£?????¨???
		sum+=a[i-1][j]*4;
		a[i-1][j]=a[i-1][j+1]=a[i-1][j+2]=a[i-1][j+3]=0;
		z=1;
		break;
	      }//end4

	      if(a[i-1][j+3]==a[i-1][j+4]){//5??£?????¨???
		sum+=a[i-1][j]*5;
		z=1;	     
		break;
	      }//end5

	      sum+=a[i-1][j]*4;;
	      a[i-1][j]=a[i-1][j+1]=a[i-1][j+2]=a[i-1][j+3]=0;
	      z=1;
	      break;
	    }//end4over

	    sum+=a[i-1][j]*3;
	    a[i-1][j]=a[i-1][j+1]=a[i-1][j+2]=0;
	    z=1;	 
	    break;
	  }//end3over
	}//?????¢?´¢??????
      }
    }//h?????¢?´¢??????
  
  if(z==1){
      //?????????????????¨???????\?
      for(j=0;j<5;j++){
	for(i=h;i>1;i--){
	  if(a[i-1][j]==0){
	    for(k=i-1;k>=1;k--)
	      a[k][j]=a[k-1][j];
	  }
	}
      }
      //      printf("finish\n");
      //???????????¨???????\???????
    }else{
      cout<<sum<<endl;
      break;
    }
  z=0;
  }//while end
  }

  }
}

C++: #include <iostream>
#include <vector>
#define mod 1000000007
using namespace std;
using LL = long long;

int h;
vector<vector<int>> stone;

bool fall(){
    bool flag=0;
    for(int i=0;i<5;i++){
        for(int j=h-1;j>0;j--){
            if(stone[j][i]==0 && stone[j-1][i]!=0){
                flag=1;
                stone[j][i]=stone[j-1][i];
                stone[j-1][i]=0;
            }
        }
    }
    return flag;
}

int erase(){
    int ret=0;
    for(int i=0;i<h;i++){
        if(stone[i][0]==stone[i][1] && stone[i][1]==stone[i][2]){
            int buf=stone[i][0];
            stone[i][0]=stone[i][1]=stone[i][2]=0;
            ret += buf*3;
            if(stone[i][3]==buf){
                stone[i][3]=0;ret+=buf;
                if(stone[i][4]==buf){stone[i][4]=0;ret+=buf;}
            }
        }
        else if(stone[i][1]==stone[i][2] && stone[i][2]==stone[i][3]){
            int buf=stone[i][1];
            stone[i][1]=stone[i][2]=stone[i][3]=0;
            ret+=buf*3;
            if(stone[i][4]==buf){stone[i][4]=0;ret+=buf;}
        }
        else if(stone[i][2]==stone[i][3] && stone[i][3]==stone[i][4]){
            int buf=stone[i][2];
            stone[i][2]=stone[i][3]=stone[i][4]=0;
            ret+=buf*3;
        }
    }
    return ret;
}

int main(){
    while(cin>>h){
        if(h==0)return 0;
        stone.resize(h);
        for(int i=0;i<h;i++)stone[i].resize(5);
        for(int i=0;i<5*h;i++)cin>>stone[i/5][i%5];

        int score=0;
        while(1){
            int buf=erase();
            score+=buf;
            if(buf==0)break;
            while(fall()){}

    
            //cout<<"#"<<score<<endl;for(int i=0;i<h;i++)for(int j=0;j<5;j++)cout<<stone[i][j]<<(j!=4?" ":"\n");
            
        }
        cout<<score<<endl;
    }
}