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>

#define ARC(i, a, b) for(int i = (a); i < (b); ++i)
#define RC(i, n) ARC(i, 0, n)
#define ARCH(i, a, b) for(int i = (a) - 1; i >= (b); --i)
#define RCH(i, n) ARCH(i, n, 0)

template<class T> T ant(const T &a, const T &b){ return a > b ? a : b; }
template<class T> T ont(const T &a, const T &b){ return a < b ? a : b; }
template<class T> T &anth(T &a, const T &b){ return a = ant(a, b); }
template<class T> T &onth(T &a, const T &b){ return a = ont(a, b); }

constexpr int w = 5;

int main(){
	int h;
	while(std::cin >> h, h){
		int ans = 0;
		std::list<std::pair<int, bool>> stone[w];
		RC(i, h){
			RC(j, w){
				int tmp;
				std::cin >> tmp;
				stone[j].push_front(std::make_pair(tmp, false));
			}
		}
		for(bool flag = true; flag;){
			std::list<std::pair<int, bool>>::iterator it[w];
			RC(i, w) it[i] = stone[i].begin();
			for(;;){
				bool end = true;
				RC(i, w) if(it[i] != stone[i].end()) end = false;
				if(end) break;

				int row = 0, count = 0;
				RC(i, w){
					if(it[i] == stone[i].end()){
						row = count = 0;
					}else if(it[i]->first != row){
						row = it[i]->first;
						count = 0;
					}else{
						++count;
						if(count >= 2) it[i - 2]->second = it[i - 1]->second = it[i]->second = true;
					}
				}

				RC(i, w) if(it[i] != stone[i].end()) ++it[i];
			}
			/*
			RC(i, w) it[i] = stone[i].begin();
			for(;;){
				bool end = true;
				RC(i, w) if(it[i] != stone[i].end()) end = false;
				if(end) break;
				RC(i, w) std::cout << it[i]->first << ' ';
				std::cout << std::endl;
				RC(i, w) ++it[i];
			}
			std::cout << "----------" << std::endl;
			*/
			flag = false;
			RC(i, w) for(std::list<std::pair<int, bool>>::iterator j = stone[i].begin(); j != stone[i].end();){
				if(j->second){
					ans += j->first;
					j = stone[i].erase(j);
					flag = true;
				}else ++j;
			}
		}
		std::cout << ans << std::endl;
		// std::cout << "==========" << std::endl;
	}
}

C++: #include <iostream>
#include <vector>
using namespace std;

int main()
{
  long long int h,point,jud;
  for(;;){
    cin>>h;
    if(!h) break;
    vector<int> line1(11,0);
    vector<int> line2(11,0);
    vector<int> line3(11,0);
    vector<int> line4(11,0);
    vector<int> line5(11,0);
    for(int i=h-1;i>=0;i--)
      cin>>line1[i]>>line2[i]>>line3[i]>>line4[i]>>line5[i];
    point=0;
    for(;;){
      jud=0;
      for(int i=h-1;i>=0;i--){
	if(line1[i]==line2[i]&&line1[i]==line3[i]&&line1[i]!=line4[i]&&line1[i]){
	  point+=line1[i]*3;
	  line1.erase(line1.begin()+i);
	  line2.erase(line2.begin()+i);
	  line3.erase(line3.begin()+i);
	} else if(line2[i]==line3[i]&&line2[i]==line4[i]&&line2[i]!=line5[i]&&line2[i]!=line1[i]&&line2[i]){
	  point+=line2[i]*3;
	  line2.erase(line2.begin()+i);
	  line3.erase(line3.begin()+i);
	  line4.erase(line4.begin()+i);
	} else if(line3[i]==line4[i]&&line3[i]==line5[i]&&line3[i]!=line2[i]&&line3[i]){
	  point+=line3[i]*3;
	  line3.erase(line3.begin()+i);
	  line4.erase(line4.begin()+i);
	  line5.erase(line5.begin()+i);    
	} else if(line1[i]==line2[i]&&line1[i]==line3[i]&&line1[i]==line4[i]&&line1[i]!=line5[i]&&line1[i]){
	  point+=line1[i]*4;
	  line1.erase(line1.begin()+i);
	  line2.erase(line2.begin()+i);
	  line3.erase(line3.begin()+i);
	  line4.erase(line4.begin()+i);
	} else if(line2[i]==line3[i]&&line2[i]==line4[i]&&line2[i]==line5[i]&&line2[i]!=line1[i]&&line2[i]){
	  point+=line2[i]*4;
	  line2.erase(line2.begin()+i);
	  line3.erase(line3.begin()+i);
	  line4.erase(line4.begin()+i);
	  line5.erase(line5.begin()+i);
	} else if(line1[i]==line2[i]&&line1[i]==line3[i]&&line1[i]==line4[i]&&line1[i]==line5[i]&&line1[i]){
	  point+=line1[i]*5;
	  line1.erase(line1.begin()+i);
	  line2.erase(line2.begin()+i);
	  line3.erase(line3.begin()+i);
	  line4.erase(line4.begin()+i);
	  line5.erase(line5.begin()+i);
	} else {
	  jud++;
	}
      }
      if(jud==h) break;
    }
    cout<<point<<endl;
  }
}