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>
using namespace std;
int main(){
  int h;
  cin >> h;
  while(h!=0){
    vector <int> lines[5];
    int b[10][5];
    int i,j,k;
    for(i=0;i<h;i++){
      for(j=0;j<5;j++){
	cin >> b[i][j];
      }
    }
    for(i=h-1;i>=0;i--){
      for(j=0;j<5;j++){
        lines[j].push_back(b[i][j]);
      }
    }
    
    int o=0;
    int f=0,ba,l;
    while(f==0){
      
      k=0;
      
      for(i=0;i<5;i++) k+=lines[i].size();
      
      for(i=h-1;i>=0;i--){
	l=0;
	ba=0;
	for(j=0;j<5;j++){
	  if(lines[j].size()>i){
	    if(ba==0){
	      ba=lines[j][i];
	      l=1;
	    }else if(ba==lines[j][i]){
	      l++;
	    }else{
	      if(l>=3){
		o+=ba*l;
		for(int a=1;a<=l;a++) lines[j-a].erase(lines[j-a].begin()+i);
	      }
	      ba=lines[j][i];
	      l=1;
	    }
	  }else{
	    ba=0;
	    l=0;
	  }
	}
	
	if(l>=3){
	  o+=ba*l;
	  for(int a=0;a<l;a++) lines[4-a].erase(lines[4-a].begin()+i);
	}	
	
      }
      for(i=0;i<5;i++) k-=lines[i].size();
      if(k==0) f=1;
    }
    
    cout << o << endl;
    cin >> h;
  }
  return 0;
}

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


int main()
{
    while (true)
    {
        int ans=0;
        int H;cin >> H;if (H==0) break;
        vector<vector<int> > board(H,vector<int> (5,0));
        for (int i=0;i<H;i++)
        {
            for (int j=0;j<5;j++)
            {
                cin >> board[i][j];
            }
        }
        bool can=true;
        while (can)
        {
            can=false;
            for (int i=0;i<H;i++)
            {
                vector<int> check;
                for (int j=0;j<4;j++)
                {
                    if (board[i][j]==board[i][j+1] && board[i][j]!=0)
                    {
                        check.push_back(j);
                    }
                }
                int cnt=0;
                for (int j=0;j<(int)check.size()-1;j++)
                {
                    if (check[j+1]-check[j]==1)
                    {
                        cnt++;
                    }
                }
                if (cnt>=1)
                {
                    cnt++;
                    can=true;
                    for (int j=0;j<check.size()-1;j++)
                    {
                        if (check[j+1]-check[j]==1)
                        {
                            ans+=board[i][check[j]]*(cnt+1);
                            for (int k=0;k<=cnt;k++)
                            {
                                board[i][check[j]+k]=0;
                            }
                            break;
                        }
                    }
                }
            }
            for (int j=0;j<5;j++)
            {
                for (int i=H-1;i>=0;i--)
                {
                    if (board[i][j]==0)
                    {
                        int k=i;
                        while (k>=0 && board[k][j]==0)
                        {
                            k--;
                            if (k==-1) break;
                        }
                        if (k!=-1)
                        {
                            board[i][j]=board[k][j];
                            board[k][j]=0;
                        }
                    }
                }
            }
        }
        cout << ans << endl;
    }
    return 0;
}