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 _GLIBCXX_DEBUG
#define all(v) (v).begin(),(v).end()

using namespace std;

using ll=long long;
using pii=pair<int, int>;
using vi=vector<int>;

const ll INF=1LL<<60;
const int MOD=1e9+7;

vector<vector<char>> ch;
vector<vector<bool>> visit;
int dx[8]={1, 0, -1, 0, 1, 1, -1, -1};
int dy[8]={0, 1, 0, -1, 1, -1, 1, -1};
int w, h;

void dfs(int x, int y){
    visit[x][y]=true;
    for(int i=0; i<8; i++){
        int nx=x+dx[i];
        int ny=y+dy[i];
        if(nx<0 || nx>=h || ny<0 || ny>=w) continue;
        if(visit[nx][ny] != 0 || ch[nx][ny] == '0') continue;
        dfs(nx, ny);
    }
}

int main(){
    while(cin >> w >> h){
        if(w==0 && h==0) break;
        ch.assign(h, vector<char>(w));
        visit.assign(h, vector<bool>(w,0));
        for(int i=0; i<h; i++){
            for(int j=0; j<w; j++){
                cin >> ch[i][j];
            }
        }
        int res=0;
        for(int i=0; i<h; i++){
            for(int j=0; j<w; j++){
                if(ch[i][j] == '1' && visit[i][j] == 0){
                    dfs(i, j);
                    res++;
                }
            }
        }
        cout << res << endl;
    }
    return 0;
}

C++: #include <iostream>
using namespace std;
int mas[50][50];
int dx[8] = {0,1,0,-1,1,-1,1,-1};
int dy[8] = {1,0,-1,0,-1,1,1,-1};
int w,h;
void dfs(int,int);

int main(){
    int cnt;
    while(1){
        cnt = 0;
        cin >> w >> h;
        if(w == 0 && h == 0)break;
        for(int i=0;i<h;i++){
            for(int j=0;j<w;j++){
                cin >> mas[i][j];
            }
        }
        for(int i=0;i<h;i++){
            for(int j=0;j<w;j++){
                if(mas[i][j] == 1){
                    cnt++;
                    dfs(j,i);
                }
            }
        }
        cout << cnt << endl;
    }
}

void dfs(int x,int y){
    mas[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 && mas[ny][nx] == 1){
            dfs(nx,ny);
        }
    }
}

C++: #include<cstring>
#define foreach(t,p) for(t::iterator it=p.begin();it!=p.end();p++)
#define REP(i,n) for(int i=0;i<n;i++)
using namespace std;
#define MAX_W 50

bool island[MAX_W+3][MAX_W+3];

int solve(int x,int y)
{
	if(!island[x][y]) {return 0;}

	island[x][y]= false;
	solve(x-1,y-1);
	solve(x-1,y);
	solve(x-1,y+1);
	solve(x,y-1);
	solve(x,y+1);
	solve(x+1,y+1);
	solve(x+1,y);
	solve(x+1,y-1);
//	cout << x << " " << y << endl;
	return 1;
}


int main()
{
	int w,h;
	while(cin >> w >> h &&w && h)
	{
		REP(i,MAX_W+2)REP(j,MAX_W+2) island[i][j]=false;
		REP(i,h)REP(j,w){cin >> island[i+1][j+1];}
		int kosu = 0;
		REP(i,h)REP(j,w){kosu += solve(i+1,j+1);}
		cout << kosu << endl;
		
	}
	return 0;
}