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 dx[]={1,0,-1,0,1,-1,-1,1};
int dy[]={0,1,0,-1,1,-1,1,-1};
int field[150][150];
void dfs(int x, int y);
int main(){
  int h,w;
  while(cin >>h>>w,h||w){
    for(int i=0; i<150; i++) for(int j=0; j<150; j++) field[i][j] = 0;
    for(int i=0; i<w; i++) for(int j=0; j<h; j++) cin >>field[i+50][j+50];
    int ans = 0;
    for(int i=0; i<w; i++){
      for(int j=0; j<h; j++){
	if(field[i+50][j+50] == 1){
	  dfs(i+50,j+50);
	  ans++;
	}
      }
    }
    cout <<ans<<endl;
  }
  return 0;
}
void dfs(int x, int y){
  field[x][y] = 0;
  for(int i=0; i<8; i++) if(field[x+dx[i]][y+dy[i]] == 1) dfs(x+dx[i],y+dy[i]);
}

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

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

int main() {
	int w, h, ans, x, y;
	int c[52][52], f[52][52];
	queue< pair<int, int> > q;
	while(1) {
		cin >> w >> h;
		if(!w&&!h) break;
		for(int i=0; i<h+2; ++i) for(int j=0; j<w+2; ++j) {
			c[i][j] = 0; f[i][j] = 0;
		}
		ans = 0;
		
		for(int i=1; i<=h; ++i) for(int j=1; j<=w; ++j) {
			cin >> c[i][j];
		}
		for(int i=1; i<=h; ++i) for(int j=1; j<=w; ++j) {
			if(c[i][j]&&!f[i][j]) {
				ans++;
				q.push( pair<int, int>(i, j) );
				while(!q.empty()) {
					y = q.front().first; x = q.front().second;
					q.pop();
					f[y][x] = 1;
					for(int k=0; k<8; ++k) {
						if(c[y+dy[k]][x+dx[k]]&&!f[y+dy[k]][x+dx[k]]) {
							q.push( pair<int, int>(y+dy[k], x+dx[k]) );
						}
					}
				}
			}
		}
		cout << ans << endl;
	}
}

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

int w,h;
int c[50][50];
vector<vector<int> > visited;
int dx[]={1,1,0,-1,-1,-1,0,1};
int dy[]={0,-1,-1,-1,0,1,1,1};

bool dfs(int x,int y){
    if(visited[x][y]) return false;
    visited[x][y]=1;

    for(int d=0;d<8;d++){
        int i=x+dx[d];
        int j=y+dy[d];
        if(0<=i&&i<h&&0<=j&&j<w){
            if(c[i][j]){
                dfs(i,j);
            }  
        }
    }
    return true;
}

int main(){
    visited.assign(50,vector<int>(50,0));
    cin>>w>>h;
    for(int i=0;i<h;i++){
        for(int j=0;j<w;j++){
            cin>>c[i][j];
        }
    }
    int cnt=0;
    for(int i=0;i<h;i++){
        for(int j=0;j<w;j++){
            if(c[i][j]){
                cnt+=dfs(i,j);
            }
        }
    }

    cout<<cnt<<endl;
    return 0;
}

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

int w, h, c[51][51];
const int dx[8] = {-1,-1,-1, 0, 0,+1,+1,+1};
const int dy[8] = {-1, 0,+1,-1,+1,-1, 0,+1};


void dfs(int x, int y){
	c[y][x] = 0;
	for(int i = 0; i < 8; i++){
		int mx = x + dx[i], my = y + dy[i];
		if( mx < 0 || my < 0 || w <= mx || h <= my ) continue;
		
		if( c[my][mx] == 1 ) dfs(mx, my);
	}
}

int main(){
	while( cin >> w >> h , w || h ){
		for(int y = 0; y < h; y++){
			for(int x = 0; x < w; x++){
				cin >> c[y][x];
			}
		}
		int ans = 0;
		for(int y = 0; y < h; y++){
			for(int x = 0; x < w; x++){
				if( c[y][x] == 1 ){
					ans++;
					dfs(x, y);
				}
			}
		}
		cout << ans << endl;
	}
}

C++: #include<stdio.h>
int h,w;
int map[50][50];
void func(int ,int);
int main(void){
	while(1){
		scanf("%d %d",&w,&h);
		if(h==0 && w==0){
			break;
		}
		int i,j;
		for(i=0;i<h;i++){
			for(j=0;j<w;j++){
				scanf("%d",&map[i][j]);
			}
		}
		/*for(i=0;i<h;i++){
			for(j=0;j<w;j++){
				printf("%d ",map[i][j]);
			}
			printf("\n");
		}*/
		int cnt=0;
		for(i=0;i<h;i++){
			for(j=0;j<w;j++){
				if(map[i][j]==1){
					map[i][j]=0;
					func(i,j);
					cnt++;
				}
			}
		}
		printf("%d\n",cnt);
		cnt=0;
	}
	return 0;
}
void func(int y,int x){
	int dy[8]={1,0,0,-1,-1,-1,1,1},dx[8]={0,1,-1,0,-1,1,-1,1};
	int i,j,xx,yy;
	for(i=0;i<8;i++){
		yy=y+dy[i];
		xx=x+dx[i];
		if(yy>=0 && yy<h && xx>=0 && xx<w && map[yy][xx]==1){
			map[yy][xx]=0;
			func(yy,xx);
		}
	}
}

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

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

using namespace std;

int main(){

  while(1){
  
    int w,h;cin>>w>>h;if(w==0&&h==0){return 0;}

  int c[h+2][w+2];memset(c,0,sizeof(c));

  for(int i=1;i<=h;i++){
    for(int j=1;j<=w;j++){
      cin>>c[i][j];
    }
  }

  queue<pair<int,int> > q;

  bool a[h+2][w+2];

  for(int i=0;i<=h+1;i++){
    for(int j=0;j<=w+1;j++){
      a[i][j]=false;
    }
  }

  int ans=0;

  for(int i=1;i<=h;i++){
    for(int j=1;j<=w;j++){
      if(c[i][j]==1&&a[i][j]==false){
	ans++;
	q.push(make_pair(i,j));
	while(!q.empty()){
	  pair<int,int> tmp=q.front();q.pop();
	  int x=tmp.first;
	  int y=tmp.second;

	  for(int i=0;i<8;i++){
	    int checkx=dx[i]+x;
	    int checky=dy[i]+y;
	    if(a[checkx][checky]==false&&c[checkx][checky]==1){
	      a[checkx][checky]=true;
	      q.push(make_pair(checkx,checky));
	    }
	  }
	  
	}
      }
    }
  }

  cout<<ans<<endl;

  }
  
  return 0;
}