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>

using namespace std;

int main(){
    while(1){
        int h;
        cin >> h;
        if(h==0) break;
        int pt = 0;
        int a[h+1][5];
        for(int i = 1; i <= h; i++){
				for(int j = 0; j < 5; j++){
					cin >> a[i][j];
				}
			}
			bool flg = true;
			while(flg){
				flg = false;
				for(int i = 1; i <= h; i++){
					for(int j = 0; j < 3; j++){
						int count = 1;
						for(int k = j + 1; k < 5; k++){
							if(a[i][j] > 0 && a[i][j] == a[i][k]){
								count += 1;
							}else{
								break;
							}
						}
						if(count > 2){
							flg = true;
							pt += a[i][j] * count;
							for(int k = j; k < j + count; k++){
								for(int l = i; l > 0; l--){
									a[l][k] = a[l - 1][k];
								}
							}
							break;
						}
					}
				}
				
			}
            cout << pt << endl;
    }
}

C++: #include <cstdio>
#include <cctype>
#include <utility>
#include <array>
#include <vector>
#include <algorithm>
using namespace std;

#define gcu getchar_unlocked
#define pcu putchar_unlocked
#define _T template <typename T>
#define _HT template <typename H, typename... T>
#define _il inline
#define _in _il int in
#define _sc _il bool scan
_T T in(int c){T n=0;bool m=false;while(isspace(c)){c=gcu();}if(c=='-')m=true,c=gcu();
	do{n=10*n+(c-'0'),c=gcu();}while(c>='0'&&c<='9');return m?-n:n;}
_in() {return in<int>(gcu());}
_T T scan(T &n){int c=gcu();return c==EOF?false:(n=in<T>(c),true);}
_sc(char &c){c=gcu();gcu();return c!=EOF;}
#ifdef _GLIBCXX_STRING
_sc(string &s){int c;s="";
	for(;;){c=gcu();if(c=='\n'||c==' ')return true;else if(c==EOF)return false;s+=c;}}
#endif
_HT _sc(H &h, T&&... t){return scan(h)&&scan(t...);}
#define _vo _il void out
#define _vl _il void outl
_vo(bool b) {pcu('0'+b);}
_vo(const char *s){while(*s)pcu(*s++);}
_vo(char c){pcu(c);}
#ifdef _GLIBCXX_STRING
_vo(string s){for(char c:s)pcu(c);}
#endif
_T _vo(T n){static char buf[20];char *p=buf;
	if(n<0)pcu('-'),n*=-1;if(!n)*p++='0';else while(n)*p++=n%10+'0',n/=10;
	while (p!=buf)pcu(*--p);}
_vl(){out('\n');}
#ifdef _GLIBCXX_VECTOR
_T _vo(vector<T> &v){for(T &x:v)out(&x == &v[0]?"":" "),out(x);outl();}
#endif
_HT _vo(H&& h, T&&... t){out(h);out(move(t)...);}
template <typename... T> _vl(T&&... t){out(move(t)...);outl();}

int main() {
	array<vector<int>, 5> a;
	for (int H; (H = in());) {
		int s = 0, t;
		for (auto &x: a)
			x.resize(H);
		while (H--)
			for (auto &x: a)
				x[H] = in();
		do {
			t = 0;
			for (size_t i = 0; i < a[2].size(); i++) {
				int u = a[2][i], c = 1;
				auto all = [&](auto f) {
					auto each = [&](array<int, 2> b) {
						for (auto j: b)
							if (a[j][i] == u)
								f(j);
							else
								break;
					};
					each({1, 0});
					each({3, 4});
				};
				all([&c](...) {c++;});
				if (c >= 3) {
					t += u;
					a[2][i] = 0;
					all([&](int j) {a[j][i] = 0, t += u;});
				}
			}
			for (auto &x: a)
				x.erase(remove(x.begin(), x.end(), 0), x.end());
			s += t;
		} while(t);
		outl(s);
	}
}

C++: #include <bits/stdc++.h>
#define PB push_back
#define MP make_pair
#define REP(i,n) for (int i=0;i<(n);i++)
#define FOR(i,a,b) for(int i=(a);i<(b);i++)
#define ALL(a) (a).begin(),(a).end()
#define MOD 100000
using namespace std;
typedef long long ll;
typedef unsigned long long ull;
typedef pair<int,int> P;
const int INF=1e9;
int H;
int fld[5][10];
void drop(){
      REP(i,5){
            REP(j,H){
                  if(fld[i][j]==-1){
                        for(int k=j;k<H;k++){
                              if(fld[i][k]!=-1){
                                    int tmp=fld[i][k];
                                    fld[i][k]=fld[i][j];
                                    fld[i][j]=tmp;
                                    break;
                              }
                        }
                  }
            }
      }
}
int main(){
      while(cin>>H&&H){
            memset(fld,-1,sizeof(fld));
            for(int i=H-1;i>=0;i--)REP(j,5)cin>>fld[j][i];
            bool update=true;
            ll ans=0;
            while(update){
                  update=false;
                  REP(i,H){
                        int s,e,d=0;bool change=false;
                        while(d<5){
                              if(fld[d][i]==-1){
                                    d++;
                                    continue;
                              }
                              s=d;
                              while(fld[s][i]==fld[d][i]&&d<5)d++;
                              if(d-s>=3){
                                    e=d;
                                    change=true;
                                    break;
                              }
                        }
                        if(change){
                              update=true;
                              ans+=(e-s)*fld[s][i];
                              for(int j=s;j<e;j++)fld[j][i]=-1;
                        }
                  }
                  drop();
            }
            cout<<ans<<endl;
      }
      return 0;
}