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;

const int MAX = 10;
int val[10][5];

int main()
{
	int H;
	while(cin >> H, H){
		for(int i = 0;i < H;i++){
			for(int j = 0;j < 5;j++){
				cin >> val[i][j];
			}
		}
		int res = 0;
		bool flag;
		do{
			flag = false;
			for(int i = 0;i < H;i++){
				int x = val[i][2];
				if(x == 0) continue;
				int l = 2, r = 3;
				while(l >= 0 && val[i][l] == x) l--;
				l++;
				while(r < 5 && val[i][r] == x) r++;
				if(r - l < 3) continue;
				flag = true;
				for(int j = l;j < r;j++){
					res += val[i][j];
					val[i][j] = 0;
				}
			}
			for(int k = 0;k < 5;k++){
				for(int i = H - 1, j = H - 1;i >= 0;i--){
					if(val[i][k] > 0){
						if(i != j) swap(val[i][k], val[j][k]);
						j--;
					}
				}
			}
		} while (flag);
		cout << res << endl;
		for(int i = 0;i < H;i++){
			for(int j = 0;j < 5;j++){
				val[i][j] = 0;
			}
		}
	}
}

C++: #include<bits/stdc++.h>
using namespace std;
int main(){
  int H;
  char mas[10][5];
  while( cin >> H, H){
    for(int i = 0; i < H; i++){
      for(int j = 0; j < 5; j++){
        cin >> mas[i][j];
      }
    }

    int ret = 0;
    bool changed = true;

    for(int foo = 0; foo < 10; foo++){
      
      for(int q = 0; q < 10; q++){
        for(int i = H - 1; i > 0; i--){
          for(int j = 0; j < 5; j++){
            if(mas[i][j] == '*'){
              swap(mas[i][j],mas[i - 1][j]); //上から持ってくる
            }
          }
        }
      }

      for(int i = 0; i < H; i++){
        char prev = mas[i][0];
        int cnt = 0;
        for(int j = 0; j < 5; j++){
          if(mas[i][j] == '*'){
            cnt = 0;
            continue;
          }
          if(mas[i][j] != prev){
            prev = mas[i][j];
            cnt = 0;
          }
          cnt++;
          if(cnt == 3){
            ret += (mas[i][j] - '0') * 3;
            for(int k = j, l = 0; l < cnt; l++, k--){
              mas[i][k] = '*';
            }
          } else if(cnt > 3){
            ret += (mas[i][j] - '0');
            mas[i][j] = '*';
          }
        }
      }
    }
    cout << ret << endl;
  }
}

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

typedef vector<vector<int>> MAP;
int H;

int erase(MAP &field) {
  int point = 0;
  for (int y = 0; y < H; ++y) {
    // erase [l, r]
    int l = 2, r = 2;
    int color = field[y][2];
    while (l > 0 and field[y][l-1] == color) l--;
    while (r < 4 and field[y][r+1] == color) r++;
//    cout << "y="<<y<<": (" << l <<", "<<r<<")"<<endl;
    if (r - l >= 2)
      for (int x = l; x <= r; ++x)
        point += field[y][x], field[y][x] = 0;
  }
  return point;
}

void drop(MAP &field) {
  for (int x = 0; x < 5; ++x) {
    vector<int> v;
    for (int y = H - 1; y >= 0; --y) {
      if (field[y][x] != 0) {
        v.push_back(field[y][x]);
        field[y][x] = 0;
      }
    }
    int y = H - 1;
    for (int color : v) {
      field[y][x] = color;
      --y;
    }
  }
}

int main() {
  while (cin >> H and H) {
    MAP field(H, vector<int>(5));
    for (int y = 0; y < H; ++y)
      for (int x = 0; x < 5; ++x)
        cin >> field[y][x];

    int sum = 0, point = 1;
    while (point > 0) {
      point = erase(field);
/*      for (int y=0;y<H;++y) {
        for (int x=0;x<5;++x)cout<<field[y][x];
        cout<<endl;
      }
      cout<<endl;*/
      sum += point;
      drop(field);
/*      for (int y=0;y<H;++y) {
        for (int x=0;x<5;++x)cout<<field[y][x];
        cout<<endl;
      }
      cout<<endl;*/
    }
    cout << sum << endl;
  }
}