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 <bits/stdc++.h>
using namespace std;

int H,W;
vector<vector<int>> field;

void dfs(int h, int w){
    field[h][w] = 0;

    for (int dh = -1; dh <= 1; ++dh) {
        for (int dw = -1; dw <= 1; ++dw) {
            int nh = h + dh, nw = w + dw;

            if(nh < 0 || nh  >= H || nw < 0 || nw >= W) continue;
            if(field[nh][nw] == 0) continue;

            dfs(nh, nw);
        }
    }
}

int main() {
    while (cin >> W >> H){
        if(H == 0 and W == 0) break;

        field.assign(H,vector<int>(W, 0));
        for (int h = 0; h < H; ++h) {
            for (int w = 0; w < W; ++w) {
                cin >> field[h][w];
            }
        }

        int count = 0;
        for (int h = 0; h < H; ++h) {
            for (int w = 0; w < W; ++w) {
                if(field[h][w] == 0) continue;
                dfs(h, w);
                count++;
            }
        }
        cout << count << endl;
    }
}

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

// 入力
int H, W;
vector<vector<int>> field;

// 探索
void dfs(int h, int w) {
    field[h][w] = 0;

    // 八方向を探索
    for (int dh = -1; dh <= 1; ++dh) {
        for (int dw = -1; dw <= 1; ++dw) {
            int nh = h + dh, nw = w + dw;

            // 場外アウトしたり、0 だったりはスルー
            if (nh < 0 || nh >= H || nw < 0 || nw >= W) continue;
            if (field[nh][nw] == 0) continue;

            // 再帰的に探索
            dfs(nh, nw);
        }
    }
}

int main() {
    // 入力受け取り
    while (cin >> W >> H) {
        if (H == 0 || W == 0) break;
        field.assign(H, vector<int>(W, 0));
        for (int h = 0; h < H; ++h) for (int w = 0; w < W; ++w) cin >> field[h][w];

        // 探索開始
        int count = 0;
        for (int h = 0; h < H; ++h) {
            for (int w = 0; w < W; ++w) {
                if (field[h][w] == 0) continue; // 残島じゃなかったらスルー
                dfs(h, w);
                ++count;
            }
        }
        cout << count << endl;
    }
}

C++: #include<iostream>
#include<iomanip>
#include<algorithm>
#include<bitset>
#include<cctype>
#include<cmath>
#include<cstdio>
#include<cstring>
#include<functional>
#include<limits>
#include<list>
#include<map>
#include<set>
#include<stack>
#include<string>
#include<sstream>
#include<queue>
#include<vector>
using namespace std;

#define MOD 1000000007
#define INF 0x3f3f3f3f
#define INFL 0x3f3f3f3f3f3f3f3fLL

#define MAX 50
#define NIL -1

static char M[MAX][MAX];
static int color[MAX][MAX];
int W, H;

void dfs(int h, int w, int c) {
	color[h][w] = c;
	if (h != H - 1 && M[h + 1][w] == '1'&&color[h + 1][w] == NIL)
		dfs(h + 1, w, c);
	if (h != 0 && M[h - 1][w] == '1'&&color[h - 1][w] == NIL)
		dfs(h - 1, w, c);
	if (w != W - 1 && M[h][w + 1] == '1'&&color[h][w + 1] == NIL)
		dfs(h, w + 1, c);
	if (w != 0 && M[h][w - 1] == '1'&&color[h][w - 1] == NIL)
		dfs(h, w - 1, c);

	if (h != H - 1 && w != W - 1 && M[h + 1][w + 1] == '1'&&color[h + 1][w] == NIL)
		dfs(h + 1, w + 1, c);
	if (h != 0 && w != 0 && M[h - 1][w - 1] == '1'&&color[h - 1][w - 1] == NIL)
		dfs(h - 1, w - 1, c);
	if (h != 0 && w != W - 1 && M[h - 1][w + 1] == '1'&&color[h - 1][w + 1] == NIL)
		dfs(h - 1, w + 1, c);
	if (h != H - 1 && w != 0 && M[h + 1][w - 1] == '1'&&color[h + 1][w - 1] == NIL)
		dfs(h + 1, w - 1, c);
}


int main() {
	while (cin >> W >> H&&H&&W) {
		for (int h = 0; h < H; h++) {
			for (int w = 0; w < W; w++) {
				cin >> M[h][w];
			}
		}
		fill(color[0], color[MAX], NIL);
		int c = 0;
		for (int h = 0; h < H; h++) {
			for (int w = 0; w < W; w++) {
				if (color[h][w] == NIL&&M[h][w] == '1') { dfs(h, w, c++); }
			}
		}
		cout << c << endl;
	}
	return 0;
}

C++: //
//  main.cpp
//  ICPC2009B
//
//  Created by aki33524 on 2014/07/02.
//  Copyright (c) 2014年 aki33524. All rights reserved.
//

#include <iostream>
using namespace std;

int H, W;
int field[50][50];
int dh[] = {0, 0, 1, -1};
int dw[] = {1, -1, 0, 0};

void dfs(int h, int w){
    field[h][w] = 0;
    for(int i=-1; i<=1; i++){
        for(int j=-1; j<=1; j++){
            int nh = h + i;
            int nw = w + j;
            if(0<=nh&&nh<H && 0<=nw&&nw<W && field[nh][nw])
                dfs(nh, nw);
        }
    }
}

void solve(){
    int ans = 0;
    for(int h=0; h<H; h++){
        for(int w=0; w<W; w++){
            if(field[h][w]){
                dfs(h, w);
                ans++;
            }
        }
    }
    cout << ans << endl;
}

int main(int argc, const char * argv[])
{
    while(cin >> W >> H, H|W){
        for(int h=0; h<H; h++){
            for(int w=0; w<W; w++){
                cin >> field[h][w];
            }
        }
        solve();
    }
    
    return 0;
}