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>

using namespace std;

#define INF 1e9

signed main(){
    ios::sync_with_stdio(false);
    cin.tie(0);

    while(1){
        int h;
        cin>>h;

        if(h==0)break;

        int c[15][5]={};

        for(int i=0;i<h;i++){
            for(int j=0;j<5;j++){
                cin>>c[i][j];
            }
        }
        
        int ans=0;

        while(1){
            bool f=true;

            for(int i=0;i<h;i++){
                int t=1;
                for(int j=0;j<4;j++){
                    if(c[i][j]==c[i][j+1] && c[i][j]!=0)t++;
                    else{
                        if(t<3)t=1;
                        else{
                            ans+=c[i][j-1]*t;
                            for(int k=0;k<t;k++)c[i][j-k-1]=0;
                            f=false;
                            t=1;
                        }
                    }
                }
                if(t>2){
                    ans+=c[i][4]*t;
                    for(int j=0;j<t;j++){
                        c[i][4-j]=0;
                    }
                    f=false;
                }
            }

            for(int i=h-2;i>=0;i--){
                for(int j=0;j<5;j++){
                    for(int k=1;i+k<h;k++){
                        if(c[i+k][j]==0){
                            c[i+k][j]=c[i+k-1][j];
                            c[i+k-1][j]=0;
                        }
                    }
                }
            }

            if(f){
                cout<<ans<<endl;

                break;
            }

        }

    }
}