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"

using namespace std;

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

    int h;
    while (cin >> h, h)
    {
        vector<vector<int>> v(h, vector<int>(5));
        for (int i = 0; i < h; i++)
        {
            for (int j = 0; j < 5; j++)
            {
                cin >> v[i][j];
            }
        }
        int res = 0;
        while (true)
        {
            bool update = false;
            for (int i = 0; i < h; i++)
            {
                if (v[i][0] != 0 && v[i][0] == v[i][1] && v[i][1] == v[i][2] && v[i][2] == v[i][3] && v[i][3] == v[i][4])
                {
                    res += 5 * v[i][0];
                    v[i][0] = v[i][1] = v[i][2] = v[i][3] = v[i][4] = 0;
                    update = true;
                    continue;
                }
                if (v[i][0] != 0 && v[i][0] == v[i][1] && v[i][1] == v[i][2] && v[i][2] == v[i][3])
                {
                    res += 4 * v[i][0];
                    v[i][0] = v[i][1] = v[i][2] = v[i][3] = 0;
                    update = true;
                    continue;
                }
                if (v[i][1] != 0 && v[i][1] == v[i][2] && v[i][2] == v[i][3] && v[i][3] == v[i][4])
                {
                    res += 4 * v[i][1];
                    v[i][1] = v[i][2] = v[i][3] = v[i][4] = 0;
                    update = true;
                    continue;
                }
                if (v[i][0] != 0 && v[i][0] == v[i][1] && v[i][1] == v[i][2])
                {
                    res += 3 * v[i][0];
                    v[i][0] = v[i][1] = v[i][2] = 0;
                    update = true;
                    continue;
                }
                if (v[i][1] != 0 && v[i][1] == v[i][2] && v[i][2] == v[i][3])
                {
                    res += 3 * v[i][1];
                    v[i][1] = v[i][2] = v[i][3] = 0;
                    update = true;
                    continue;
                }
                if (v[i][2] != 0 && v[i][2] == v[i][3] && v[i][3] == v[i][4])
                {
                    res += 3 * v[i][2];
                    v[i][2] = v[i][3] = v[i][4] = 0;
                    update = true;
                    continue;
                }
            }
            if (!update)
                break;
            for (int i = h - 2; i >= 0; i--)
            {
                for (int j = 0; j < 5; j++)
                {
                    if (v[i][j] == 0 || v[i + 1][j] != 0)
                        continue;
                    int sx = i;
                    while (sx <= h - 2 && v[sx + 1][j] == 0)
                    {
                        swap(v[sx][j], v[sx + 1][j]);
                        sx++;
                    }
                }
            }
        }
        cout << res << endl;
    }
}