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 <vector>
#include <algorithm>
using namespace std;

int main() {
    int H;
    while(cin >> H, H) {
        vector<vector<int>> v(H, vector<int>(5)); // [h][w]
        for(int i=0; i<v.size(); ++i) {
            for(int j=0; j<5; ++j) {
                cin >> v[i][j];
            }
        }
        reverse(v.begin(), v.end());

        int ret = 0;
        bool updated = true;
        while(updated) {
            for(int h=0; h<v.size(); ++h) {
                int prev = v[h][0], cnt = 1;
                int left = -1, right = 4;
                for(int w=1; w<5; ++w) {
                    if(prev == v[h][w]) {
                        ++cnt;
                    } else if(prev != v[h][w] && cnt >= 3) {
                        right = w-1;
                        break;
                    } else {
                        cnt = 1;
                    }
                    prev = v[h][w];
                }
                if(cnt >= 3) {
                    ret += prev * cnt;
                    left = right - cnt + 1;
                    for(int w=left; w<=right; ++w) {
                        v[h][w] = 0;
                    }
                }
            }
            updated = false;
            if(H != 1) {
                for(int h=0; h<v.size(); ++h) {
                    for(int w=0; w<5; ++w) {
                        if(v[h][w] == 0) {
                            int h2 = h+1;
                            while(h2 < H && v[h2][w] == 0) {
                                h2++;
                            }
                            if(h2 == H) continue;

                            int tmp_h = h;
                            while(h2 < H) {
                                v[tmp_h][w] = v[h2][w];
                                v[h2][w] = 0;
                                tmp_h++;
                                h2++;
                            }
                            updated = true;
                        }
                    }
                }
            }
        }
        cout << ret << endl;
    }
}

C++: #include <iostream>
using namespace std;
int main(){
  int h;
  while (cin>>h,h|h!=0){
    string temp;
    int board[h][6];
    for (int i=0;i<h;i++){
      cin>>board[i][0]>>board[i][1]>>board[i][2]>>board[i][3]>>board[i][4];
    }
    int num,count;
    int check=0;
    int score=0;
    while (1){
      check=score;
      for (int i=h-2;i>=0;i--){
	for (int j=0;j<5;j++){
	  for (int k=h-1;k>i;k--){
	    if (board[k][j]==0){
	      board[k][j]=board[i][j];
	      board[i][j]=0;
	      break;
	    }
	  }
	}
      }
      for (int i=0;i<h;i++){
	count=1;
	num=0;
	for (int j=0;j<5;j++){
	  if (board[i][j]==num){
	    count++;
	  }
	  else{
	    if (count>2)
	      break;
	    count=1;
	  }
	  num=board[i][j];
	}
	if (count<=2)
	  num=0;
	for (int j=0;j<5;j++){
	  if (board[i][j]==num){
	    board[i][j]=0;
	    score=score+num;
	  }
	}
      }
      if (check==score){
	break;
      }
    }
    cout<<score<<endl; 
  }
}