Go: package main

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

var (
	readString func() string
	readBytes  func() []byte
	stdout     *bufio.Writer
)

func init() {
	readString, readBytes = newReadString(os.Stdin)
	stdout = bufio.NewWriter(os.Stdout)
}

func newReadString(ior io.Reader) (func() string, func() []byte) {
	r := bufio.NewScanner(ior)
	r.Buffer(make([]byte, 1024), math.MaxInt32)
	r.Split(bufio.ScanWords)

	f1 := func() string {
		if !r.Scan() {
			panic("Scan failed")
		}
		return r.Text()
	}
	f2 := func() []byte {
		return []byte(f1())
	}
	return f1, f2
}

func readInt() int {
	return int(readInt64())
}

func readInt64() int64 {
	i, err := strconv.ParseInt(readString(), 10, 64)
	if err != nil {
		panic(err.Error())
	}
	return i
}

func readFloat64() float64 {
	f, err := strconv.ParseFloat(readString(), 64)
	if err != nil {
		panic(err.Error())
	}
	return f
}

func printf(f string, args ...interface{}) (int, error) {
	return fmt.Fprintf(stdout, f, args...)
}

func println(args ...interface{}) (int, error) {
	return fmt.Fprintln(stdout, args...)
}

func eprintln(args ...interface{}) (int, error) {
	return fmt.Fprintln(os.Stderr, args...)
}

func eprintf(f string, args ...interface{}) (int, error) {
	return fmt.Fprintf(os.Stderr, f, args...)
}

func min(a, b int) int {
	if a < b {
		return a
	}
	return b
}

func min64(a, b int64) int64 {
	if a < b {
		return a
	}
	return b
}

func max(a, b int) int {
	if a < b {
		return b
	}
	return a
}

func max64(a, b int64) int64 {
	if a < b {
		return b
	}
	return a
}

func abs(a int) int {
	if a < 0 {
		return -a
	}
	return a
}

func abs64(a int64) int64 {
	if a < 0 {
		return -a
	}
	return a
}

func gcd(a, b int) int {
	if b == 0 {
		return a
	}
	return gcd(b, a%b)
}

func gcd64(a, b int64) int64 {
	if b == 0 {
		return a
	}
	return gcd64(b, a%b)
}

// readString() string
// readInt() int
// readInt64() int64
// readFloat64() float64

// -----------------------------------------------------------------------------

func main() {
	defer stdout.Flush()

	for {
		ans, ok := solve()
		if !ok {
			break
		}
		println(ans)
	}

}

func solve() (int, bool) {
	w := readInt()
	h := readInt()
	if w == 0 && h == 0 {
		return 0, false
	}

	c := make([][]int, h+2)
	c[0] = make([]int, w+2)
	c[h+1] = make([]int, w+2)
	for i := 1; i-1 < h; i++ {
		c[i] = make([]int, w+2)
		for j := 1; j-1 < w; j++ {
			c[i][j] = readInt()
		}
	}

	var ans int
	for i := 1; i-1 < h; i++ {
		for j := 1; j-1 < w; j++ {
			if 0 < c[i][j] {
				ans++
				dfs(c, i, j)
			}
		}
	}
	return ans, true
}

func dfs(c [][]int, y, x int) {
	c[y][x] = 0
	dx := []int{-1, 0, 1, -1, 1, -1, 0, 1}
	dy := []int{-1, -1, -1, 0, 0, 1, 1, 1}
	for i := range dx {
		nx := x + dx[i]
		ny := y + dy[i]
		if 0 < c[ny][nx] {
			dfs(c, ny, nx)
		}
	}
}

// -----------------------------------------------------------------------------

C++: #include "bits/stdc++.h"
#define REP(i, n, N) for(ll i=(n); i < N; i++)
#define CK(N, A, B) (A <= N && N < B)
#define p(s) cout << (s) << endl
#define p2(a, b) cout << (a) << ' ' << (b) << endl
using namespace std;
typedef long long ll;

const int NODE_SIZE=10101;
int H;
int W;
int start_y, start_x;
int island_num=2;

int field[NODE_SIZE][NODE_SIZE];

int d[NODE_SIZE][NODE_SIZE];

int dx[8]={0,1,1,1,0,-1,-1,-1};
int dy[8]={-1,-1,0,1,1,1,0,-1};

void bfs(){
    queue<pair<int,int>> q;
    bool visited[H][W];
    REP(i,0,H) REP(j,0,W) visited[i][j]=false;
    REP(i,0,H) REP(j,0,W) d[i][j]=-1;
    q.push({start_y, start_x});
    d[start_y][start_x]=0;
    while(!q.empty()){
        int cur_y = q.front().first;
        int cur_x = q.front().second;
        int curStep = d[cur_y][cur_x];
        q.pop();
        if(visited[cur_y][cur_x]) continue;
        visited[cur_y][cur_x] = true;
        field[start_y][start_x]=island_num;

        REP(k,0,8){
            int next_y = cur_y + dy[k];
            int next_x = cur_x + dx[k];

            if(!CK(next_y,0,H) || !CK(next_x,0,W))continue;
            if(field[next_y][next_x]==1){
                field[next_y][next_x]=island_num;
            }else{
                continue;
            }
            if(!visited[next_y][next_x]){
                q.push({next_y, next_x});
                d[next_y][next_x] = d[cur_y][cur_x] + 1;
            }
        }
    }
}

int main() {
    while (cin >> W >> H && W){
        island_num = 2;
        REP(i,0,H){
            REP(j,0,W){
                cin >> field[i][j];
            }
        }
        REP(i,0,H){
            REP(j,0,W){
                if(field[i][j]==1){
                    start_y=i,start_x=j;
                    bfs();
                    island_num++;
                }
            }
        }
        p(island_num-2);
    }

    return 0;
}

C++: #include <iostream>
using namespace	std;
int h,w,c[50][50];
void dfs(int y,int x){
  c[y][x]=0;
  for(int i=-1;i<=1;i++)
    for(int j=-1;j<=1;j++)
      if(0<=y+i&&y+i<h&&0<=x+j&&x+j<w)
        if(c[y+i][x+j]) dfs(y+i,x+j);
}

int main(){

  for(;cin>>w>>h,w;){
    int r=0;
    for(int i=0;i<h;i++) for(int j=0;j<w;j++) cin>>c[i][j];
    for(int i=0;i<h;i++) for(int j=0;j<w;j++){
        if(c[i][j]){
          r++;
          dfs(i,j);
        }
      }
    cout<<r<<endl;
  }
  return 0;

}

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

void search(int y, int x, int h, int w, int** field) {
    field[y][x] = 0;
    for (int ny = y - 1; ny <= y + 1; ny++) {
        for (int nx = x - 1; nx <= x + 1; nx++) {
            if (0 <= ny && ny < h && 0 <= nx && nx < w && field[ny][nx] == 1) {
                search(ny, nx, h, w, field);
            }
        }
    }
}

int main() {
    while (true) {
        int w, h;
        cin >> w >> h;
        if ((w | h) == 0) {
            break;
        }
        int** field = new int* [h];
        for (int i = 0; i < h; i++) {
            field[i] = new int [w];
        }
        for (int y = 0; y < h; y++) {
            for (int x = 0; x < w; x++) {
                cin >> field[y][x];
            }
        }
        int count = 0;
        for (int y = 0; y < h; y++) {
            for (int x = 0; x < w; x++) {
                if (field[y][x] == 1) {
                    search(y, x, h, w, field);
                    count++;
                }
            }
        }
        cout << count << endl;
        for (int i = 0; i < h; i++) {
            delete[] field[i];
        }
        delete[] field;
    }
}

C++: #include<iostream>
#include<queue>
using namespace std;
int dx[] = {1,1,0,-1,-1,-1,0,1};
int dy[] = {0,1,1,1,0,-1,-1,-1};
int c[51][51];
int main()
{

	int w, h;

	while (cin >> w && cin >> h && w != 0 && h != 0)
	{
		for (int i = 1; i < h + 1; i++)
		{
			for (int j = 1; j < w + 1; j++)
			{
				int tmp;
				cin >> tmp;
				if (tmp == 0)
				{
					c[i][j] = -1;
				}
				else
				{
					c[i][j] = 0;
				}
			}
		}

		int count = 0;
		queue<pair<int,int>> q;
		for (int i = 1; i < h + 1; i++)
		{
			for (int j = 1; j < w + 1; j++)
			{
				if (c[i][j] != 0)continue;
				q.push(make_pair(i,j));
				c[i][j] = 1;
				while (q.size() > 0)
				{
					pair<int, int> p = q.front();
					q.pop();
					int y = p.first;
					int x = p.second;

					for (int d = 0; d < 8; d++)
					{
						int nx = x + dx[d];
						int ny = y + dy[d];

						if (nx < 1 || ny < 1 || nx > w || ny > h)continue;
						if (c[ny][nx] != 0)continue;
						q.push(make_pair(ny, nx));
						c[ny][nx] = 1;
					}
				}
				count++;
			}
		}

		cout << count << endl;


	}

	return 0;
}