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>
#include<string>
#include<cstdlib>
#include<map>
#include<iomanip>
#include<sstream>
#include<vector>
#include<stack>
#include<math.h>
#include<queue>
#include<complex>
using namespace std;



int main() {
    const long long int mod = 1000000007,INF=99999999999999;
	map<long long int, long long int>mp;
    string str[2005],tmp;
	cout << fixed << setprecision(10);
    
    
    while(1){
        long long int n,paz[20][6],res=0;
        cin>>n;
        if(n==0){
            return 0;
        }
        for(int j=1;j<=5;j++){
                paz[0][j]=999;
            }
        for(int i=n;i>=1;i--){
            for(int j=1;j<=5;j++){
                cin>>paz[i][j];
            }
        }

        for(int t=1;t<=20;t++){
            for(int i=1;i<=n;i++){
                if(paz[i][1]==paz[i][2]&&paz[i][3]==paz[i][2]&&paz[i][4]==paz[i][3]&&paz[i][4]==paz[i][5]){
                    res+=paz[i][1]*5;
                    paz[i][1]=0;
                    paz[i][2]=0;
                    paz[i][3]=0;
                    paz[i][4]=0;
                    paz[i][5]=0;
                }else if(paz[i][1]==paz[i][2]&&paz[i][3]==paz[i][2]&&paz[i][4]==paz[i][3]){
                    res+=paz[i][1]*4;
                    paz[i][1]=0;
                    paz[i][2]=0;
                    paz[i][3]=0;
                    paz[i][4]=0;
                }else if(paz[i][3]==paz[i][2]&&paz[i][4]==paz[i][3]&&paz[i][4]==paz[i][5]){
                    res+=paz[i][2]*4;
                    
                    paz[i][2]=0;
                    paz[i][3]=0;
                    paz[i][4]=0;
                    paz[i][5]=0;
                }else if(paz[i][1]==paz[i][2]&&paz[i][3]==paz[i][2]){
                     res+=paz[i][2]*3;
                    paz[i][1]=0;
                    paz[i][2]=0;
                    paz[i][3]=0;
                }else if(paz[i][3]==paz[i][2]&&paz[i][4]==paz[i][3]){
                     res+=paz[i][2]*3;
                    paz[i][2]=0;
                    paz[i][3]=0;
                    paz[i][4]=0;
                }else  if(paz[i][4]==paz[i][3]&&paz[i][4]==paz[i][5]){
                    res+=paz[i][3]*3;
                    paz[i][3]=0;
                    paz[i][4]=0;
                    paz[i][5]=0;
                }
            }
            for(int k=1;k<=10;k++){
                for(int j=1;j<=5;j++){
                    for(int i=1;i<=n;i++){
                        if(paz[i-1][j]==0){
                            paz[i-1][j]=paz[i][j];
                            paz[i][j]=0;
                        }
                    }
                }
            }
            
            
        }
        cout<<res<<endl;
    }
    
}