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<map>
#include<vector>
#include<algorithm>
#include<cmath>
#include<climits>
#include<ctime>
#include<cstring>
#include<stack>
#include<queue>
#include<sstream>
#include<string>

#define ALL(v) (v).begin(),(v).end()
#define REP(i,p,n) for(int i=p;i<(int)(n);++i)
#define rep(i,n) REP(i,0,n)
#define DUMP(list) cout << "{ "; for(auto nth : list){ cout << nth << " "; } cout << "}" << endl;


using namespace std;

int MAP[10][5];
int h;
void fall(){
  rep(i,h){
    for(int i=h-1;i>0;i--) rep(j,5){
      if(MAP[i][j]==-1){
        MAP[i][j]=MAP[i-1][j];
        MAP[i-1][j]=-1;
      }
    }
  }
}

int search(int x,int y,int num,int count){
  
  if(x<0||y<0||x>=5) return count;
  if(MAP[y][x]==-1||MAP[y][x]!=num) return count;
  

  int ans = 0;
  count++;
  count = search(x+1,y,num,count);

  if(count>=3) MAP[y][x]=-1;

  return count;
}

int main(){

  while(1){
    cin >> h;

    if(h==0) break;

    int ans=0;
    int p_score=-1;
      memset(MAP,-1,sizeof(MAP));
      rep(i,h) rep(j,5) cin >> MAP[i][j];


      while(1){
        rep(i,h) rep(j,5){
          int point = MAP[i][j];  
          int combo = search(j,i,MAP[i][j],0);
          if(combo>=3){
            //cout << combo << " " << point << endl;
            ans+=combo*point;
          }
        }

        fall();

        if(p_score==ans) break;
        p_score=ans;
      }
    cout << ans << endl;
  }

}

C++: #include <iostream>
#include <cstdio>
#define EMPTY -1
using namespace std;

int main()
{
  int h;
  for(;;){
    scanf("%d",&h);
    if(h==0)return 0;
    int map[h][5];
    //????????????????????????
    for(int i=0;i<h;i++){for(int j=0;j<5;j++){scanf("%d",&map[i][j]);}}
    bool next = true;    //???????¶????????????£?????´???false??¨??????for???????????????
    int point = 0;   //????¨????????????????
    for(;;){
      if(!next)break;
      next = false;
      //???????¨????????????????
      for(int i=0;i<h;i++){  //???????????????????????????????????????(i)
	for(int j = 0;j<5;j++){  //??????????§???°???(j)
	  if(map[i][j]==EMPTY)continue;
	  int count = 1;  //??£?¶??????????????????°(count)
	  int k;  //????????°???(k)
	  for(k=j+1;k<5;k++){
	    if(k>=5)break;
	    if(map[i][j]!=map[i][k])break;
	    count++;
	  }
	  if(count>=3){   //??£?¶???????????????´???
	    next = true;    //?¶????????????????????????????for??????????????????
	    point+=map[i][j]*count;  //????????????
	    for(int l=0;l<count;l++){ //????????????
	      map[i][j+l]=EMPTY;
	    }
	    count=1;
	  }
	}
      }
      //????????????
      for(int i=0;i<5;i++){  //???????????????????????????????????????(i,0-5)
	for(int j=h-1;j>=0;j--){  //??\?????????????§???°???(j,(h-1)-0)
	  if(map[j][i]!=EMPTY)continue;
	  for(int k=(j-1);k>=0;k--){  //????§???°???????????????????¨?
	    if(k<0)break;
	    if(map[k][i]!=EMPTY){  //?????????????????£??????????§???°?????¨??\?????????
	      map[j][i]=map[k][i];
	      map[k][i]=EMPTY;
	      break;
	    }
	  }
	}
      } 
    }
    printf("%d\n",point);
  }
}