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 <algorithm>
using namespace std;

int main()
{
  while(1){
    int H;
    cin >> H;
    if(H == 0) break;
    int p[H][5];
    int ans = 0;
    for(int i = 0; i < H; i++)
      for(int j = 0; j < 5; j++)
        cin >> p[i][j];
    bool flag = true;
    while(flag){
      flag = false;
      for(int i = 0; i < H; i++){
        int x = p[i][2];
        if(x == -1) continue;
        int n = count(&p[i][0], &p[i + 1][0], x);
        if(n == 3){
          if(p[i][0] == x && p[i][1] == x){
            flag = true;
            ans += 3 * x;
            for(int j = 0; j < 3; j++)
              p[i][j] = -1;
          }else if(p[i][3] == x && p[i][4] == x){
            flag = true;
            ans += 3 * x;
            for(int j = 2; j < 5; j++)
              p[i][j] = -1;
          }else if(p[i][1] == x && p[i][3] == x){
            flag = true;
            ans += 3 * x;
            for(int j = 1; j < 4; j++)
              p[i][j] = -1;
          }
        }else if(n == 4){
          flag = true;
          ans += 4 * x;
          if(p[i][0] == x){
            for(int j = 0; j < 4; j++)
              p[i][j] = -1;
          }else{
            for(int j = 1; j < 5; j++)
              p[i][j] = -1;
          } 
        }else if(n == 5){
          flag = true;
          ans += 5 * x;
          for(int j = 0; j < 5; j++)
            p[i][j] = -1;
        }
      }
/*
      for(int j = 0; j < H; j++){
        for(int k = 0; k < 5; k++){
          cout << p[j][k];
        }
        cout << endl;
      }
*/    
      
      for(int j = H - 1; j > 0; j--){
        for(int k = 0; k < 5; k++){
          if(p[j][k] == -1){
            for(int l = j - 1; l >= 0; l--){
              if(p[l][k] != -1){
                swap(p[j][k], p[l][k]);
                break;
              }
            }
          }
        }
      }

/*
      for(int j = 0; j < H; j++){
        for(int k = 0; k < 5; k++){
          cout << p[j][k];
        }
        cout << endl;
      }
      */
      
    }
    cout << ans << endl;
  }
}

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

#define reps(i,j,k) for(int i=(j);i<(k);++i)
#define rep(i,j) reps(i,0,j)
#define fs first
#define sc second
#define pb push_back

using namespace std;
typedef long long ll;
typedef pair<int,int> pii;
typedef vector<int> vi;

template<class S, class T>
ostream &operator<<(ostream &out, const pair<S,T> &p){
	return out << "(" << p.fs << ", " << p.sc << ")";
}

template<class T>
ostream &operator<<(ostream &out, const vector<T> &v){
	out << "{";
	rep(i,v.size())
		out << v[i] << ", ";
	return out << "}" << endl;
}


int bo[100][10];
int bo2[100][10];

int main(){
	int H;

	for(;;){
		int r;
		bool f;

		scanf("%d",&H);
		if(H==0)return 0;
		rep(i,100)rep(j,10)bo2[i][j]=bo[i][j]=0;
		rep(i,H)rep(j,5)scanf("%d",&bo[H-i-1][j]);

		r=0;
		for(;;){
			f=true;
			
			rep(i,H)rep(j,5)bo2[i][j]=bo[i][j];
			rep(i,H)rep(j,3)if(bo[i][j] != 0 && bo[i][j] == bo[i][j+1] && bo[i][j+1]==bo[i][j+2]){
				f=false;
				rep(k,3){
					r += bo2[i][j+k];
					bo2[i][j+k]=0;
				}
			}
			rep(i,H)rep(j,5)bo[i][j]=bo2[i][j];
			if(f)break;
			
			rep(j,5){
				rep(i,25){
					if(bo[i][j]==0){
						int k=i+1;
						for(;k<70;k++){
							if(bo[k][j]!=0)break;
						}
						//cerr << k << " ";
						rep(l,25){
							bo[i+l][j] = bo[k+l][j];
						}
					}
				}
			}
			/*
			cerr << "###############" <<endl;
			rep(i,H){
				rep(j,5) cerr << bo[i][j] <<" ";
				cerr << endl;
			}
			*/
		}

		printf("%d\n",r);
	}
	return 0;
}