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<iostream>
using namespace std;
int ans;
int map[100][100];
void dfs(int x,int y,int w,int h);
int dx[8] = {1,1,0,-1,-1,-1,0,1},dy[8] = {0,1,1,1,0,-1,-1,-1};

int main(){
  int w,h;
  while(cin>>w>>h){
    ans=0;
    if(w == 0 && h == 0)break;
    for(int i = 0;i<h;i++)
      for(int j = 0;j<w;j++) 
	cin>>map[i][j];
    for(int i = 0;i<h;i++)
      for(int j = 0;j<w;j++){
	if(map[i][j] == 1){
	  map[i][j] = 0;
	  ans++;
	  dfs(i,j,w,h);
	}
      }
    // cout<<"map"<<endl;
    // for(int a=0;a<h;a++){
    //   for(int b=0;b<w;b++) cout<<map[a][b];
    //   cout<<endl;
    // }
    // cout<<endl;
    cout<<ans<<endl;
  }
  return 0;
}

void dfs(int x,int y,int w,int h){
  //cout<<"LK+LKJ"<<endl;
  int nx,ny;
  for(int i = 0;i<8;i++){
    nx = x+dx[i]; ny = y+dy[i];
    if(nx>=0 && nx<w && ny>=0 && ny<h && map[ny][nx] == 1){
      map[ny][nx] = 0;
      dfs(nx,ny,w,h);
    }
  }
}

C++: #include<bits/stdc++.h>
using namespace std;

int w,h,C[100][100];
int diff[8][2]={{-1,-1},{-1,0},{-1,1},{0,-1},{0,1},{1,-1},{1,0},{1,1}};

void dfs(int x,int y){
    int i;
    C[x][y]=0;
    for(i=0;i<8;i++){
        if(x+diff[i][0]>=0 && x+diff[i][0]<h && y+diff[i][1]>=0 && y+diff[i][1]<w){
            if(C[x+diff[i][0]][y+diff[i][1]]==1){
                dfs(x+diff[i][0],y+diff[i][1]);
            }
        }
    }
}

int main(){
    int i,j,ans;
    while(cin>>w>>h,w!=0||h!=0){
        ans=0;
        for(i=0;i<h;i++)for(j=0;j<w;j++)cin>>C[i][j];
        for(i=0;i<h;i++){
            for(j=0;j<w;j++){
                if(C[i][j]==1){
                    dfs(i,j);
                    ans++;
                }
            }
        }
        cout<<ans<<endl;
    }
}

C++: #include <iostream>
#include <vector>
#include <queue>

using namespace std;

int main()
{
    int w, h;
    while (cin >> w >> h, w | h) {
        vector<vector<int> > map(h, vector<int>(w));
        for (int i = 0; i < h; ++i) {
            for (int j = 0; j < w; ++j) {
                cin >> map[i][j];
            }
        }

        // bfs
        int islandCount = 0;
        for (int i = 0; i < h; ++i) {
            for (int j = 0; j < w; ++j) {
                queue<pair<int, int> > que;
                if (map[i][j] != 1) {
                    continue;
                }
                ++islandCount;
                que.push({i, j});
                while (!que.empty()) {
                    pair<int, int> p = que.front(); que.pop();
                    if (map[p.first][p.second] == -1) {
                        continue;
                    }
                    map[p.first][p.second] = -1;
                    for (int k = -1; k < 2; ++k) {
                        for (int l = -1; l < 2; ++l) {
                            if ((k | l) == 0) {
                                continue;
                            }
                            int ny = p.first + k;
                            int nx = p.second + l;
                            if (0 <= nx && nx < w &&
                                    0 <= ny && ny < h) {
                                if (map[ny][nx] == 1) {
                                    que.push({ny, nx});
                                }
                            }
                        }
                    }
                }
            }
        }
        cout << islandCount << endl;
    }

    return 0;
}

C++: #include <iostream>
#include <utility>

using namespace std;

bool check(bool[50][50],pair<int,int>);
void rmv(bool[50][50],int,int);

int main(void){
	for(int w,h;cin>> w >> h,w||h;){
		bool fld[50][50]={0};
		int n;

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

		for(n=0;check(fld,make_pair(w,h));n++);
		cout << n << endl;
	}
	return 0;
}

bool check(bool fld[50][50],pair<int,int> wide){
	for(int i=0;i<wide.second;i++)
		for(int j=0;j<wide.first;j++)
			if(fld[i][j]){
				rmv(fld,i,j);
				return true;
			}

	return false;
}

void rmv(bool fld[50][50],int y,int x){
	if(x>=0&&y>=0&&x<=50&&y<=50)
		if(fld[y][x]){
			fld[y][x]=false;
			for(int i=-1;i<=1;i++)
				for(int j=-1;j<=1;j++)
					rmv(fld,y+i,x+j);
		}
}