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<fstream>

using namespace std;

	ifstream fin;
	ofstream fout;

	//http://judge.u-aizu.ac.jp/onlinejudge/description.jsp?id=1160&lang=jp

	int gomi = 0;

	int a[52][52] = {};
	int check(int, int);

	int main(){

		fin.open("input.txt");
		fout.open("output.txt");

		//		int w = 0, h = 0;
		int width = 0, height = 0;
		int count = 0;


		while (1){
			for (int i = 0; i < 50; i++)
				for (int j = 0; j < 50; j++)
					a[i + 1][j + 1] = 0;

			cin >> width >> height;
			if (width == 0 && height == 0)break;

			for (int i = 0; i < height; i++){
				for (int j = 0; j < width; j++){
					//初期化
					gomi = a[i + 1][j + 1] = 0;

					cin >> a[i + 1][j + 1];
				}
			}

			for (int i = 0; i < height; i++){
				for (int j = 0; j < width; j++){
					if (a[i + 1][j + 1] == 1){
						check(i + 1, j + 1);
//						a[i + 1][j + 1] = 1;
						count++;
					//	cout << i + 1 << "  " << j + 1 << endl;
					}
				}
			}
//			cout << count << endl;
			fout << count << endl;

			//初期化
			count = 0;
			for (int i = 0; i < height; i++){
				for (int j = 0; j < width; j++){
					a[i + 1][j + 1] = 0;
				}
			}
		}
	}

	int check(int y, int x){
		for (int i = -1; i <= 1; i++)
			for (int j = -1; j <= 1; j++){
			if (i == 0 && j == 0)
				j++;
			check(y + i, x + j);
			}
	return 0;
	}

/*	int check(int y, int x){
		if (a[y + 1][x] == 1){
			a[y + 1][x] = 0;
			check(y + 1, x);
		}
		//-----------------------------
		if (a[y][x + 1] == 1){
			a[y][x + 1] = 0;
			check(y, x + 1);
		}
		//-----------------------------
		if (a[y - 1][x] == 1){
			a[y - 1][x] = 0;
			check(y - 1, x);
		}
		//-----------------------------
		if (a[y][x - 1] == 1){
			a[y][x - 1] = 0;
			check(y, x - 1);
		}
		//-----------------------------
		if (a[y + 1][x + 1] == 1){
			a[y + 1][x + 1] = 0;
			check(y + 1, x + 1);
		}
		//-----------------------------
		if (a[y + 1][x - 1] == 1){
			a[y + 1][x - 1] = 0;
			check(y + 1, x - 1);
		}
		//-----------------------------
		if (a[y - 1][x + 1] == 1){
			a[y - 1][x + 1] = 0;
			check(y - 1, x + 1);
		}
		//-----------------------------
		if (a[y - 1][x - 1] == 1){
			a[y - 1][x - 1] = 0;
			check(y - 1, x - 1);
		}
		//-----------------------------
		return 0;
	}*/

C++: #include <iostream>
#include <vector>
using namespace std;
int n, w;
//vector<vector<int>> c(50,vector<int>(50));
//vector<vector<bool>> visit(50,vector<bool>(50));
int c[50][50] = {};
bool visit[50][50] = {};
void dfs(int x, int y){
    
    if(x < 0 || y < 0 || x >= w || y >= n) return;
    if(visit[x][y] == true) return;

    visit[x][y] = true;
    
    dfs(x+1, y);
    dfs(x-1, y);
    dfs(x, y+1);
    dfs(x, y-1);
    dfs(x+1, y+1);
    dfs(x+1, y-1);
    dfs(x-1, y+1);
    dfs(x-1, y-1);
}


int main(void){

    cin >> n >> w;
    
    while(n != 0 && w != 0){
    
    
        for(int i = 0; i < w; i++){
            for(int j = 0; j < n; j++){
                cin >> c[i][j];
                if(c[i][j] == 0) visit[i][j] = true;
            }
        }
        
        int ans = 0;
        
        for(int i = 0; i < w; i++){
            for(int j = 0; j < n; j++){
                if(!visit[i][j]){
                dfs(i, j);
                ans++;
                }
            }
        }
        
        cout << ans << endl;
        
        for(int i = 0; i < 50; i++){
            for(int j = 0; j < 50; j++){
                visit[i][j] = false;
            }
        }
        
        cin >> n >> w;
    }
}

C++: #define _GLIBCXX_DEBUG

#include <stdio.h>
#include <math.h>
#include <string.h>
#include <stdlib.h>
#include <algorithm>

#include <numeric>
#include <iostream>
#include <string>
#include <vector>
#include <queue>
#include <deque>
#include <stack>
#include <set>
#include <map>
#include <cstdio>
#include <cstdlib>
#include <cassert>
#include <cstring>
#include <cmath>
#include <complex>

#define REP(i,a,b) for(int i=a; i<b; i++)
#define rep(i,n) REP(i,0,n)
#define FOR(i,c) for(typeof((c).begin())i=(c).begin();i!=(c).end(); ++i)

#define EXIST(e,s)((s).find(e)!=(s).end())
#define RESET(a) memset((a),0,sizeof(a))
#define SET(a) memset((a),-1,sizeof(a))

#define ll long long

using namespace std;

int w, h;
int num;
int field[50][50];

int d[8][2] = {{-1,-1},{0,-1},{1,-1},{-1,0},{1,0},{-1,1},{0,1},{1,1}};

void search(int x, int y){
  if(field[y][x] == 1){
    field[y][x] = 0;
    for(int i=0; i<8; i++){
      if(0<=x+d[i][0] && x+d[i][0]<w && 0<=y+d[i][1] && y+d[i][1]<h){
	search(x+d[i][0], y+d[i][1]);
      }
    }
  }
}

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

    for(int i=0; i<h; i++){
      for(int j=0; j<w; j++){
	if(field[i][j] == 1){
	  num++;
	  search(j, i);
	}
      }
    }
    cout << num << endl;
  }
  
  return 0;
}