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 <algorithm>
#include <cstring>
#include <functional>
#include <iostream>
#include <map>
#include <set>
#include <stdlib.h>
#include <string>
#include <utility>
#include <vector>
#define rep(i, n) for (int i = 0; i < (n); i++)
#define loop(i, x, n) for (int i = (x); i < (n); i++)
#define all(v) (v).begin(), (v).end()
#define int long long
using namespace std;
const int MOD = 1e9 + 7;
const int INF = 1e10;
template<typename T> void cmax(T &a, T b) { a = max(a, b); }
template<typename T> void cmin(T &a, T b) { a = min(a, b); }
int h;
int score;
void f(int mp[20][5]) {
  int diff[5] = {};
  bool change = true;
  rep(i, h) {
    int tar = INF;
    int s;
    rep(j, 3) if (mp[i][j] != 0 && mp[i][j] == mp[i][j + 1] && mp[i][j + 1] == mp[i][j + 2]) {
      tar = mp[i][j];
      s = j;
      change = false;
      break;
    }
    // cout << tar << ' ' << s << endl;
    if (tar == INF) continue;
    loop(j, s, 5) {
      if (mp[i][j] == tar) {
        score += tar;
        diff[j]++;
        mp[i][j] = 0;
      } else
        break;
    }
  }
  // cout << score << endl;
  rep(l, h) {
    rep(i, 5) {
      for (int j = h - 1; j > 0; j--) {
        if (mp[j][i] == 0) {
          for (int k = j; k > 0; k--) {
            mp[k][i] = mp[k - 1][i];
          }
        }
      }
    }
  }
  rep(i, 5) rep(j, diff[i]) mp[j][i] = 0;
  // cout << endl;
  // rep(i, h) {
  //   rep(j, 5) cout << mp[i][j] << ' ';
  //   cout << endl;
  // }

  if (change) {
    return;
  } else {
    f(mp);
  }
}

signed main() {
  while (cin >> h) {
    if (h == 0) break;
    int mp[20][5] = {};
    score = 0;
    rep(i, h) rep(j, 5) cin >> mp[i][j];

    f(mp);
    cout << score << endl;
  }
  return 0;
}

C++: #include <iostream>
#include <stdio.h>
#include <string.h>
#include <math.h>
#include <algorithm>
#include <stdlib.h>
#include <vector>
#include <stack>

using namespace std;


int main(){
	int n;

	while(1){
		cin >> n;
		if(n==0) break;

		int paz[n][5];

		for(int i=0 ; i<n ; i++){
			for(int j=0 ; j<5 ; j++){
				cin >> paz[i][j];
			}
		}

		/*
		for(int i=0 ; i<n ; i++){
			for(int j=0 ; j<5 ; j++){
				cout << paz[i][j];
			}
			cout << endl;
		}
		*/


		int end_flag = 0;
		int score = 0;

		while(1){
			if(end_flag == 1) break;


			//????????¨??????????????????
			int combo;
			end_flag = 1;
			for(int i=0 ; i<n ; i++){

				combo = 0;

				if(paz[i][0] != 0 && paz[i][0] == paz[i][1] && paz[i][1] == paz[i][2]){
					combo = 1;
					end_flag = 0;
				}else if(paz[i][1] != 0 && paz[i][1] == paz[i][2] && paz[i][2] == paz[i][3]){
					combo = 2;
					end_flag = 0;
				}else if(paz[i][2] != 0 && paz[i][2] == paz[i][3] && paz[i][3] == paz[i][4]){
					combo = 3;
					end_flag = 0;
				}



				//cout << combo << endl;

				if(combo == 1){
					if(paz[i][0] == paz[i][4]){
						for(int j=0 ; j<5 ; j++){
							score += paz[i][j];
							paz[i][j] = 0;
						}
					}else if(paz[i][0] == paz[i][3]){
						for(int j=0 ; j<4 ; j++){
							score += paz[i][j];
							paz[i][j] = 0;
						}
					}else{
						for(int j=0 ; j<3 ; j++){
							score += paz[i][j];
							paz[i][j] = 0;
						}
					}
				}else if(combo == 2){
					if(paz[i][1] == paz[i][4]){
						for(int j=1 ; j<5 ; j++){
							score += paz[i][j];
							paz[i][j] = 0;
						}
					}else{
						for(int j=1; j<4 ; j++){
							score += paz[i][j];
							paz[i][j] = 0;
						}
					}
				}else if(combo == 3){
					for(int j=2 ; j<5 ; j++){
						score += paz[i][j];
						paz[i][j]=0;
					}
				}

			}

			//????????¨????????°????¨????????????????0???????????¨????????????????????????
			/*
			for(int i=0 ; i<n ; i++){
				for(int j=0 ; j<5 ; j++){
					cout << paz[i][j];
				}
				cout << endl;
			}
			cout << endl;
			*/

			for(int k=0 ; k<n ; k++){
				for(int i=1 ; i<n ; i++){
					for(int j=0 ; j<5 ; j++){
						if(paz[i][j] == 0){
							paz[i][j] = paz[i-1][j];
							paz[i-1][j] = 0;
						}
					}
				}
			}


			/*
			for(int i=0 ; i<n ; i++){
				for(int j=0 ; j<5 ; j++){
					cout << paz[i][j];
				}
				cout << endl;
			}
			*/

		}

		cout << score << endl;

	}
	return 0;
}