Go: package main

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

const (
	initialBufSize = 100000
	maxBufSize     = 1000000
)

var sc *bufio.Scanner

func initScanner(r io.Reader) *bufio.Scanner {
	buf := make([]byte, initialBufSize)

	sc := bufio.NewScanner(r)
	sc.Buffer(buf, maxBufSize)
	sc.Split(bufio.ScanWords) // bufio.ScanLines
	return sc
}

func main() {
	sc = initScanner(os.Stdin)
	resolve()
}

func resolve() {
	results := []int{}
	for true {
		w, h := scanInt(sc), scanInt(sc)
		if w == 0 && h == 0 {
			break
		}
		grid := make([][]int, h)
		for i := 0; i < h; i++ {
			grid[i] = make([]int, w)
			for j := 0; j < w; j++ {
				grid[i][j] = scanInt(sc)
			}
		}
		num := 0
		for i := range loop0(h) {
			for j := range loop0(w) {
				start := pos{y: i, x: j}
				if grid[start.y][start.x] == 0 {
					continue
				}
				num++
				_dfs(grid, w, h, start)
			}
		}
		results = append(results, num)
	}
	for _, v := range results {
		fmt.Println(v)
	}
	return
}

func _dfs(grid [][]int, w, h int, start pos) {
	grid[start.y][start.x] = 0
	for _, df := range []pos{
		pos{1, 0}, pos{-1, 0},
		pos{0, -1}, pos{0, 1},
		pos{1, 1}, pos{-1, -1},
		pos{-1, 1}, pos{1, -1},
	} {
		np := addPos(start, df)
		if np.y < 0 || h <= np.y || np.x < 0 || w <= np.x {
			continue
		}
		if grid[np.y][np.x] == 0 {
			continue
		}
		_dfs(grid, w, h, np)
	}
}

type pos struct{ x, y int }

func addPos(p, d pos) pos {
	return pos{
		x: p.x + d.x,
		y: p.y + d.y,
	}
}

func loop0(n int) chan int {
	return loop(0, n-1, 1)
}

func loop1(n int) chan int {
	return loop(1, n, 1)
}

func loop(s, e, d int) chan int {
	ch := make(chan int)
	go func() {
		for i := s; i <= e; i += d {
			ch <- i
		}
		close(ch)
	}()
	return ch
}

// snip-scan-funcs
func scanInt(sc *bufio.Scanner) int {
	sc.Scan()
	i, _ := strconv.Atoi(sc.Text())
	return int(i)
}
func scanString(sc *bufio.Scanner) string {
	sc.Scan()
	return sc.Text()
}

C++: #include <iostream>
#include <cstdio>
#include <cstring>
#include <climits>
#include <string>
#include <algorithm>
#include <cmath>
#include <vector>
#include <stack>
#include <queue>
#include <map>
#include <unordered_map>
#include <set>
#include <unordered_set>
#include <sstream>
#include <numeric>
// #include <boost/multiprecision/cpp_dec_float.hpp>
// #include <boost/multiprecision/cpp_int.hpp>

///////////////////////////////////////////////////////////////
// namespace
///////////////////////////////////////////////////////////////
using namespace std;
// namespace mp = boost::multiprecision;

///////////////////////////////////////////////////////////////
// types
///////////////////////////////////////////////////////////////
using pii = pair<int, int>;
using ll = long long int;
using ld = long double;
// using mpi = mp::cpp_int;
// using mpf = mp::number<mp::cpp_dec_float<1024>>;

///////////////////////////////////////////////////////////////
// mod https://qiita.com/drken/items/3b4fdf0a78e7a138cd9a
///////////////////////////////////////////////////////////////
// ll MOD = 1000000007;
// ll mod(long long val) {
//     long long res = val % MOD;
//     if (res < 0) res += MOD;
//     return res;
// }
// ll modinv(ll a) {
//     ll b = MOD, u = 1, v = 0;
//     while (b) {
//         ll t = a / b;
//         a -= t * b; swap(a, b);
//         u -= t * v; swap(u, v);
//     }
//     u %= MOD;
//     if (u < 0) u += MOD;
//     return u;
// }

int w, h;
vector<vector<int>> c;

bool dfs(int i, int j) {
    if (c[i][j] == 0) return false;
    c[i][j] = 0;
    if (i - 1 >= 0) dfs(i - 1, j);
    if (i + 1 < h) dfs(i + 1, j);
    if (j - 1 >= 0) dfs(i, j - 1);
    if (j + 1 < w) dfs(i, j + 1);
    if (i - 1 >= 0 && j - 1 >= 0) dfs(i - 1, j - 1);
    if (i - 1 >= 0 && j + 1 < w) dfs(i - 1, j + 1);
    if (i + 1 < h && j + 1 < w) dfs(i + 1, j + 1);
    if (i + 1 < h && j - 1 >= 0) dfs(i + 1, j - 1);
    return true;
}

bool solve() {
    cin >> w >> h;
    if (w == 0 && h == 0) return false;
    c = vector<vector<int>>(h, vector<int>(w));
    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) {
            ans += dfs(i, j);
        }
    }
    cout << ans << endl;
    return true;
}

int main() {
    while (solve());
    return 0;
}

C++: #include<bits/stdc++.h>
/*
#include<iostream>
#include<vector>
#include<algorithm>
 */
using namespace std;
typedef long long ll;
#define F first
#define S second
#define pii pair<int, int>
#define eb emplace_back
#define all(v) v.begin(), v.end()
#define rep(i, n) for (int i = 0; i < n; ++i)
#define rep3(i, l, n) for (int i = l; i < n; ++i)
#define chmax(a, b) a = (a >= b ? a : b)
#define chmin(a, b) a = (a <= b ? a : b)
#define out(a) cout << a << endl
#define outa(a, n) rep(_, n) cout << a[_] << " "; cout << endl
#define SZ(v) (int)v.size()
#define inf (int)(1e9+7)
#define abs(x) (x >= 0 ? x : -(x))
#define ceil(a, b) a / b + !!(a % b)
#define FIX(a) fixed << setprecision(a)

int h, w;
bool c[50][50];
int cnt;
int reached[50][50];
void dfs(int y, int x) {
    rep3(i, -1, 2) rep3(j, -1, 2) {
        if ((i | j) == 0) continue;
        int ny = y + i;
        int nx = x + j;
        if (ny < 0 || ny >= h || nx < 0 || nx >= w) continue;
        if (reached[ny][nx] == 1 || c[ny][nx] == 0) continue;
        reached[ny][nx] = 1;
        dfs(ny, nx);
    }
}
int main() {
    while (cin >> w && w) {
        cin >> h;
        fill_n(*reached, 50 * 50, 0);
        rep(i, h) rep(j, w) cin >> c[i][j];
        cnt = 0;
        rep(i, h) rep(j, w) {
            if (c[i][j] == 0 || reached[i][j] == 1) continue;
            reached[i][j] = 1;
            cnt++;
            dfs(i, j);
            // rep(k, h) { rep(l, w) cout << reached[k][l] << " "; cout << endl; }
        }
        out(cnt);
    }
}

C++: #include<iostream>

using namespace std;

int map[50][50];
int h,w;
int dx[]={-1,0,1},dy[]={-1,0,1};
void loop(int ,int );
int main(){
	int cnt=0;
	while(cin>>h>>w,h){
		for(int i=0;i<w;i++){
			for(int j=0;j<h;j++){
				cin>>map[i][j];
			}
		}
		for(int i=0;i<w;i++){
			for(int j=0;j<h;j++){
				if(map[i][j]==1){
					loop(i,j);	
					cnt++;	
				}
			}
		}
		cout<<cnt<<endl;
		for(int i=0;i<w;i++){
			for(int j=0;j<h;j++){
				map[i][j]=0;
			}
		}
	}
	return 0;
}
void loop(int x,int y){
	map[x][y]=0;
	for(int i=0;i<3;i++){
		for(int j=0;j<3;j++){
			if(map[x+dx[i]][y+dy[j]]==1){
				loop(x+dx[i],y+dy[j]);
			}
		}
	}
	return ;
}

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

int m[51][51];
bool v[51][51];
int h,w,c=0;
int dx[8]={-1,-1,0,1,1,1,0,-1};
int dy[8]={0,-1,-1,-1,0,1,1,1};
void dfs(int x,int y){
    if(v[y][x])return;
    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&&!v[y][x]&&m[ny][nx]){
            dfs(nx,ny);
        }
    }
}
int main(){
    cin>>h>>w;
    for(int i=0;i<h;i++){
        for(int j=0;j<w;j++){
            cin>>m[i][j];
            v[i][j]=0;
        }
    }
    for(int i=0;i<h;i++){
        for(int j=0;j<w;j++){
            if(!v[i][j]&&m[i][j]){
                dfs(i,j);
                c++;
            }
        }
    }
    cout<<c<<endl;
}