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 "bits/stdc++.h"
#include <random>
#define REP(i,a,b) for(i=a;i<b;++i)
#define rep(i,n) REP(i,0,n)
#define ll long long
#define ull unsigned ll
typedef long double ld;
#define SQR(X)  ( (X)*(X) )
#define CUBE(X) ( (X)*(X)*(X) )
#define ALL(a) (a).begin(),(a).end()
#define ifnot(a) if(not a)
#define dump(x)  cerr << #x << " = " << (x) << endl
using namespace std;
 
 
void reader(int &a){scanf("%d",&a);}
void reader(double &a){scanf("%lf",&a);}
void reader(char a[]){scanf("%s",a);}
void reader(ll &a){scanf("%lld",&a);}
void reader(ull &a){scanf("%llu",&a);}
// void reader(string& a){cin >> a;};
template<class T,class U> void reader(T& t,U& u){reader(t); reader(u);}
template<class T,class U,class V> void reader(T& t,U& u,V& v){reader(t); reader(u); reader(v);}
 
void writer(int a,char c) {printf("%d",a); putchar(c);}
void writer(ll a,char c) {printf("%lld",a); putchar(c);}
void writer(double a,char c) {printf("%.20lf",a); putchar(c);}
void writer(char a[]) {printf("%s",a);};
void writer(char a[],char c) {printf("%s",a);putchar(c);};
void writer(char a,char c) {putchar(a); putchar(c);};
template<class T>void writerLn(T t){writer(t,'\n');}
template<class T,class U>void writerLn(T t,U u){writer(t,' ');writer(u,'\n');}
template<class T,class U,class V> void writerLn(T t,U u,V v){writer(t,' ');writer(u,' ');writer(v,'\n');}
template<class T> void writerArr(T x[], int n){int i;if(!n){putchar('\n');return;}rep(i,n-1) writer(x[i],' ');writer(x[n-1],'\n');}
template<class T> void writerVec(vector<T> x){int n=x.size();int i;if(!n){putchar('\n');return;}rep(i,n-1) writer(x[i],' ');writer(x[n-1],'\n');}
 
vector<std::string> split(const std::string &str, char sep){std::vector<std::string> v;std::stringstream ss(str);std::string buffer;while(std::getline(ss,buffer,sep)){v.push_back(buffer);}return v;}
 
// #define int ll
bool test = false;
int dx[] = { 0,0,1,-1 };
int dy[] = { 1,-1,0,0 };
ull mod = (int)1e9 + 7;
//..................
int H;
int a[10][6];
int cnt = 0;
void erace() {
  int i,j,k;
  rep(i,H) rep(j,3) {
	if(a[i][j] == -1) continue;
	if(a[i][j] == a[i][j+1] && a[i][j] == a[i][j+2]) {
	  int target = a[i][j];
	  REP(k,j,5) {
		if (a[i][k] == target) {
		  cnt += target; a[i][k] = -1;
		}
		else break;
	  }
	}
  }
  /*
  rep(i,H) {
	rep(j,5) {
	  printf("%d ",a[i][j]);
	}
	puts("");
  }
  */
}
signed main(){
  int i,j,k,l;
  while(1) {
	cnt = 0;
	cin >> H;
	if (H == 0) break;
	rep(i,H) rep(j,5) {
	  reader(a[i][j]);
	}
	bool is_continue = true;
	while(is_continue) {
	  erace();
	  is_continue = false;
	  rep(k,5) {
		for(i=H-1;i>-1;i--) {
		  if(a[i][k] != -1) continue;
		  for(j=i-1;j>-1;j--) {
			if(a[j][k] != -1) break;
		  }
		  if(j != -1) is_continue = true;
		  
		  a[i][k] = a[j][k];
		  a[j][k] = -1;
		}
	  }
	}
	cout << cnt << endl;
  }

  return 0;
}

C++: #include <iostream>
using namespace std;
int main(){
  int h;
  while (cin>>h,h|h!=0){
    string temp;
    int board[h][6];
    for (int i=0;i<h;i++){
      cin>>board[i][0]>>board[i][1]>>board[i][2]>>board[i][3]>>board[i][4];
    }
    int num,count;
    int check=0;
    int score=0;
    while (1){
      check=score;
      for (int i=h-2;i>=0;i--){
	for (int j=0;j<5;j++){
	  for (int k=h-1;k>i;k--){
	    if (board[k][j]==0){
	      board[k][j]=board[i][j];
	      board[i][j]=0;
	      break;
	    }
	  }
	}
      }
      for (int i=0;i<h;i++){
	count=1;
	num=0;
	for (int j=0;j<5;j++){
	  if (board[i][j]==num){
	    count++;
	  }
	  else{
	    if (count>2)
	      break;
	    count=1;
	  }
	  num=board[i][j];
	}
	if (count<=2)
	  num=0;
	score=score+num*count;
	int ii=0;
	for (int j=0;j<5;j++){
	  if ((ii==count-1||j==4||board[i][j+1]==num)&&board[i][j]==num){
	    board[i][j]=0;
	    ii++;
	  }
	  if (ii==count)
	    break;
	}
      }
      if (check==score){
	break;
      }
    }

    cout<<score<<endl; 
  }
}