Go: package main

import (
	"bufio"
	"fmt"
	"os"
	"strconv"
)

func getScanner(fp *os.File) *bufio.Scanner {
	scanner := bufio.NewScanner(fp)
	scanner.Split(bufio.ScanWords)
	scanner.Buffer(make([]byte, 1000005), 1000005)
	return scanner
}

func getNextString(scanner *bufio.Scanner) string {
	scanner.Scan()
	return scanner.Text()
}

func getNextInt(scanner *bufio.Scanner) int {
	i, _ := strconv.Atoi(getNextString(scanner))
	return i
}

func getNextInt64(scanner *bufio.Scanner) int64 {
	i, _ := strconv.ParseInt(getNextString(scanner), 10, 64)
	return i
}

func getNextUint64(scanner *bufio.Scanner) uint64 {
	i, _ := strconv.ParseUint(getNextString(scanner), 10, 64)
	return i
}

func getNextFloat64(scanner *bufio.Scanner) float64 {
	i, _ := strconv.ParseFloat(getNextString(scanner), 64)
	return i
}

func main() {
	fp := os.Stdin
	wfp := os.Stdout
	cnt := 0

	if os.Getenv("MASPY") == "ますピ" {
		fp, _ = os.Open(os.Getenv("BEET_THE_HARMONY_OF_PERFECT"))
		cnt = 0
	}
	if os.Getenv("MASPYPY") == "ますピッピ" {
		wfp, _ = os.Create(os.Getenv("NGTKANA_IS_GENIUS10"))
	}

	scanner := getScanner(fp)
	writer := bufio.NewWriter(wfp)
	for solve(scanner, writer) {

	}
	for i := 0; i < cnt; i++ {
		fmt.Fprintln(writer, "-----------------------------------")
		solve(scanner, writer)
	}
	writer.Flush()
}

func solve(scanner *bufio.Scanner, writer *bufio.Writer) bool {
	sol := solver{}
	sol.w = getNextInt(scanner)
	sol.h = getNextInt(scanner)
	if sol.w == 0 && sol.h == 0 {
		return false
	}
	sol.land = makeInts(sol.h, sol.w)
	for y := 0; y < sol.h; y++ {
		for x := 0; x < sol.w; x++ {
			sol.land[y][x] = getNextInt(scanner)
		}
	}
	ans := 0
	for y := 0; y < sol.h; y++ {
		for x := 0; x < sol.w; x++ {
			if sol.land[y][x] == 0 {
				continue
			}
			ans++
			sol.dfs(y, x)
		}
	}
	fmt.Fprintln(writer, ans)
	return true
}

type solver struct {
	w, h int
	land [][]int
}

func (sol *solver) dfs(y, x int) {
	if y < 0 {
		return
	}
	if y >= sol.h {
		return
	}
	if x < 0 {
		return
	}
	if x >= sol.w {
		return
	}
	if sol.land[y][x] == 0 {
		return
	}
	sol.land[y][x] = 0
	dy := [8]int{-1, -1, -1, 0, 0, 1, 1, 1}
	dx := [8]int{-1, 0, 1, -1, 1, -1, 0, 1}
	for i := 0; i < 8; i++ {
		sol.dfs(y+dy[i], x+dx[i])
	}
}
func makeInts(h, w int) [][]int {
	index := make([][]int, h, h)
	data := make([]int, h*w, h*w)
	for i := 0; i < h; i++ {
		index[i] = data[i*w : (i+1)*w]
	}
	return index
}

C++: #include <iostream>
#include <iomanip>
#include <vector>
#include <stack>
#include <queue>
#include <set>
#include <map>
#include <algorithm>
#include <cstdio>
#include <utility>
#include <string>
#include <cmath>
#include <cstdlib>
#include <cstring>

using namespace std;

typedef uint64_t u64;
typedef int64_t s64;
typedef uint32_t u32;
typedef int32_t s32;
typedef vector<s32> vs32;
typedef vector<u32> vu32;
typedef vector<s64> vs64;
typedef vector<u64> vu64;

const double PI=3.14159265358979323846;

#define MAX(x, y) ((x) < (y) ? (y) : (x))
#define MIN(x, y) ((x) > (y) ? (y) : (x))

#define rep(i, N) for(int i = 0; i < N; ++i)

#define CEIL(x, y) (((x) + (y) - 1) / (y))
#define MOD 1000000007ULL

#define IN(l, r, x) ((l) <= (x) && (x) < (r))

int W, H;
vector< vs32 > field(50, vs32(50));

void dfs(int y, int x)
{
    field[y][x] = 0;

    for (int dy = -1; dy <= 1; ++dy)
    {
        for (int dx = -1; dx <= 1; ++dx)
        {
            int nx = x + dx;
            int ny = y + dy;
            if (IN(0, W, nx) && IN(0, H, ny) && field[ny][nx] == 1)
            {
                dfs(ny, nx);
            }
        }
    }

    return;
}

int main()
{
    cin.tie(0);
    ios::sync_with_stdio(false);

    while (true)
    {
        cin >> W >> H;
        if (H == 0 || W == 0) break;

        rep (i, H) rep (j, W) cin >> field[i][j];

        int ans = 0;
        rep (i, H)
        {
            rep (j, W)
            {
                if (field[i][j] == 1)
                {
                    dfs(i, j);
                    ++ans;
                }
            }
        }
        cout << ans << "\n";
    }

    return 0;
}

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

int myMap[50][50];
int w, h;
int ans;

bool safe(int x, int y){
    return (0 <= x && 0 <= y) && (x < w && y < h);
}

void del(int x, int y){
    myMap[x][y] = 0;
    if (safe(x+1, y) && myMap[x+1][y]) del(x+1, y);
    if (safe(x+1, y+1) && myMap[x+1][y+1]) del(x+1, y+1);
    if (safe(x+1, y-1) && myMap[x+1][y-1]) del(x+1, y-1);
    if (safe(x, y+1) && myMap[x][y+1]) del(x, y+1);
    if (safe(x, y-1) && myMap[x][y-1]) del(x, y-1);
    if (safe(x-1, y-1) && myMap[x-1][y-1]) del(x-1, y-1);
    if (safe(x-1, y+1) && myMap[x-1][y+1]) del(x-1, y+1);
    if (safe(x-1, y) && myMap[x-1][y]) del(x-1, y);
    return;
}

int main(){

    while (1){
	cin >> w >> h;
	if (w == 0 && h == 0) break;

	for (int i = 0; i < h; i++){
	    for (int j = 0; j < w; j++){
		cin >> myMap[i][j];
	    }
	}

	ans = 0;	
	for (int i = 0; i < w; i++){
	    for (int j = 0; j < h; j++){
		if (myMap[i][j] == 1){
		    ans++;
		    del(i, j);
		}
	    }
	}

	cout << ans << endl;
    }
    
}

C++: #include <bits/stdc++.h>

class Solve {
private:
	using vb = std::vector<bool>;
	using vvb = std::vector<vb>;

	int h, w;
	vvb map;

	void dfs(int r, int c)
	{
		if (!map[r][c]) return;
		map[r][c] = false;
		for (int i{r - 1}; i <= r + 1; i++)
			for (int j{c - 1}; j <= c + 1; j++)
				dfs(i, j);
	}

public:
	bool is_last_query{};
	Solve()
	{
		scanf("%d%d", &w, &h);
		if (w == 0)
		{
			is_last_query = true;
			return;
		}
		map.resize(h + 2, vb(w + 2));
		for (int i{1}; i <= h; i++)
			for (int j{1}; j <= w; j++)
			{
				int c;
				scanf("%d", &c);
				map[i][j] = c == 1;
			}

		int count{};
		for (int i{1}; i <= h; i++)
			for (int j{1}; j <= w; j++)
			{
				if (!map[i][j]) continue;
				count++;
				dfs(i, j);
			}

		printf("%d\n", count);
	}
};

int main()
{
	while (!Solve().is_last_query);

	return 0;
}

C++: #include <vector>
#include <list>
#include <map>
#include <set>
#include <deque>
#include <stack>
#include <bitset>
#include <algorithm>
#include <functional>
#include <numeric>
#include <utility>
#include <sstream>
#include <iostream>
#include <iomanip>
#include <cstdio>
#include <cmath>
#include <cstdlib>
#include <cctype>
#include <string>
#include <cstring>
#include <ctime>
#include <fstream>
#include <queue>
#include <complex>

#define INF 100000000
#define EPS 1e-9

using namespace std;

typedef long long ll; 

#define MAX_W 50
#define MAX_H 50

int W, H;
int c[MAX_H][MAX_W];

vector<int> ans_list;

int dx[] = {-1,0,1,-1,1,-1,0,1};
int dy[] = {-1,-1,-1,0,0,1,1,1};

void solve(int x, int y){
  
  c[y][x] = 0;
  
  for(int i = 0; i < 8; i++){
    int nx = x + dx[i];
    int ny = y + dy[i];
    if(nx >= 0 && nx < W && ny >= 0 && ny < H && c[ny][nx] == 1)
      solve(nx, ny);
  }

}

int main(){
  
  while(true){
    
    cin >> W >> H;
    if(W == 0 && H == 0)
      break;

    for(int i = 0; i < H; i++){
      for(int j = 0; j < W; j++){
	cin >> c[i][j];
      }
    }

    int ans = 0;
    for(int i = 0; i < H; i++){
      for(int j = 0; j < W; j++){
	if(c[i][j] == 1){
	  ans++;
	  solve(j,i);
	}
      }
    }
    
    ans_list.push_back(ans);

  }

  for(int i = 0; i < ans_list.size(); i++){
    cout << ans_list[i] << endl;
  }
  
  return 0;
  
}