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<string>
#include<vector>
#include<map>
using namespace std;

int res;
vector<string> input(int n){
    vector<string> res;
    for(int i = 0 ; i < n ; i ++){
        string line;
        for(int j = 0 ; j < 5 ; j ++){
            char c;
            cin>>c;
            line += c;
        }
        res.push_back(line);
        line="";
    }
    return res;
}

pair<string,int> chek(string s){
    int res = 0;
    string nu ="00000";
    // a a a a a 
//    cout<<"che"<<endl<<s<<endl;   
    if(s[0] == s[1] && s[1] == s[2] && s[2] == s[3] && s[3] == s[4] && s[0] != '0'){
        return make_pair(nu,(s[0] - '0') * 5);
    }
    // a a a a b
    if(s[0] == s[1] && s[1] == s[2] && s[2] == s[3] && s[0] != '0'){
        return make_pair(nu.substr(0,4)+s.substr(4,1),(s[0] - '0') * 4);
    }
    // b a a a a
    if(s[1] == s[2] && s[2] == s[3] && s[3] == s[4] && s[1] != '0'){
        return make_pair(s.substr(0,1)+nu.substr(0,4),(s[1] - '0') * 4);
    }
    // a a a b c
    if(s[0] == s[1] && s[1] == s[2] && s[0] != '0'){
        return make_pair(nu.substr(0,3)+s.substr(3,2),(s[0] - '0') * 3);
    }
    // b a a a c 
    if(s[1] == s[2] && s[2] == s[3] && s[1] != '0'){
        return make_pair(s.substr(0,1)+nu.substr(0,3)+s.substr(4,1),(s[1] - '0') * 3);
    }
    // b c a a a
    if(s[2] == s[3] && s[3] == s[4] && s[2] != '0'){
        return make_pair(s.substr(0,2)+nu.substr(0,3),(s[2] - '0') * 3);
    }
    return make_pair(s,0);
}
vector<string> move(vector<string> line){
    for(int i = line.size() - 2 ; i >= 0 ; i --){
        for(int j = 0 ; j < 5 ; j ++){
            if(line[i+1][j] == '0'){
                line[i+1][j] = line[i][j];
                line[i][j] = '0';
            }
        }
    }
    return line;
}
int main(void){
    int n;
    while(cin>>n,n){
        res = 0;
        vector<string> in = input(n);
//        cout<<in.size()<<endl;
//        for(int i = 0 ; i < in.size(); i ++)cout<<in[i]<<endl;
        if(in.size() == 1){
            pair<string,int> line = chek(in[0]);
            cout<<line.second<<endl;
        }else{
            bool con = true;
            int ll=0;
            while(con){
//                cout<<endl;
                con = false;
                for(int i = 0 ; i < in.size() ; i ++){
                    pair<string,int> line = chek(in[i]);
                    in[i] = line.first;
                    res += line.second;
                    if(line.second)con=true;
                    in = move(in);
                }
//            for(int i = 0 ; i < in.size() ; i ++)cout<<in[i]<<endl;
            }
//            for(int i = 0 ; i < in.size() ; i ++)cout<<in[i]<<endl;
            cout<<res<<endl;
        }
    }
}

C++: #include "bits/stdc++.h"
using namespace std;
#define int long long
#define REP(i, s, n) for (signed i = (s); i < signed(n); i++)
#define rep(i, n) REP(i, 0, n)
#define all(c) (c).begin(), (c).end()

using VV = vector<vector<int>>;
using V = vector<int>;
using P = pair<int, int>;
using IP = pair<int, P>;

const double EPS = 1e-9;

template<typename Func>
double search(double left, double right, Func f) {
	for (int loop = 0; loop < 100000; ++loop) {
		if (f((left * 2 + right) / 3) < f((left + right * 2) / 3)) {
			right = (left + right * 2) / 3;
		} else {
			left = (left * 2 + right) / 3;
		}
	}
	return (right + left) * 0.5;
}

signed main() {
	int h;
	while (cin >> h && h) {
		VV board(h, V(5));
		rep(i, h) rep(j, 5) cin >> board[i][j];
		int score = 0;

		while (true) {
			int added = 0;
			VV next = board;
			rep(i, h) rep(j, 3) {
				if (board[i][j] == board[i][j + 1] && board[i][j] == board[i][j + 2]) {
					added += next[i][j] + next[i][j + 1] + next[i][j + 2];
					next[i][j] = next[i][j + 1] = next[i][j + 2] = 0;
				}
			}
			score += added;
			board = move(next);
			rep(j, 5) {
				int shift = 0;
				for (int i = h - 1; i >= 0; i--) {
					board[i + shift][j] = board[i][j];
					shift += board[i][j] == 0;
				}
			}
			if (added == 0) break;
		}

		cout << score << endl;
	}
}