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;

class Solver {
    public:
        int h;
        int num[10][5];
        int solve() {
            bool has_changed = true;
            int score = 0;
            while (has_changed) {
                has_changed = false;
                for (int y = 0; y < h; ++y) {
                    for (int x = 0; x < 5; ++x) {
                        if (num[y][x] == 0) {
                            continue;
                        }
                        for (int x2 = x + 1; x2 <= 5; ++x2) {
                            if (x2 != 5 && num[y][x2] == num[y][x]) {
                                continue;
                            }
                            if (x2 - x > 2) {
                                has_changed = true;
                                for (int x3 = x; x3 < x2; ++x3) {
                                    score += num[y][x3];
                                    num[y][x3] = 0;
                                }
                            }
                            break;
                        }
                    }
                }
                for (int x = 0; x < 5; ++x) {
                    for (int y = h - 1; y >= 0; --y) {
                        if (num[y][x] > 0) {
                            continue;
                        }
                        for (int y2 = y; y2 >= 0; --y2) {
                            if (num[y2][x] > 0) {
                                num[y][x] = num[y2][x];
                                num[y2][x] = 0;
                                break;
                            }
                        }
                    }
                }
            }
            return score;
        }
};

int main() {
    Solver s;
    while (true) {
        cin >> s.h;
        if (s.h == 0) {
            return 0;
        }
        for (int y = 0; y < s.h; ++y) {
            for (int x = 0; x < 5; ++x) {
                cin >> s.num[y][x];
            }
        }
        cout << s.solve() << endl;
    }
}

C++: #include <iostream>
#include <vector>
#include <string>
#include <cstring>
#include <algorithm>
#include <set>

#define REP(i,k,n) for(int i=k;i<n;i++)
#define rep(i,n) for(int i=0;i<n;i++)

using namespace std;
typedef long long ll;

int main()
{
    int n;
    while(cin >> n && n) {
        vector<vector<char> > v(n);
        rep(i,n) {
            rep(j,5) {
                char c;
                cin >> c;
                v[i].push_back(c);
            }
        }

        int ans = 0;
        while(true) {
            bool flag = true;

            rep(i,n) {
                rep(j,3) {
                    if(v[i][j] == '0') continue;

                    int len = 1;
                    REP(k,j+1,5) {
                        if(v[i][j] == v[i][k]) {
                            len++;
                        }
                        else break;
                    }

                    if(len >= 3) {
                        flag = false;
                        REP(k,j,j+len) {
                            ans += v[i][k] - '0';
                            v[i][k] = '0';
                        }
                    }
                }
            }

            if(flag) break;

            for(int i=n-1;i>0;i--) {
                rep(j,5) {
                    if(v[i][j] != '0') continue;

                    int y = i-1;
                    while(0 < y && v[y][j] == '0') y--;
                    swap(v[i][j],v[y][j]);
                }
            }
        }

        cout << ans << endl;
    }

    return 0;
}