Go: package main

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

func getScanner(fp *os.File) *bufio.Scanner {
	scanner := bufio.NewScanner(fp)
	scanner.Split(bufio.ScanWords)
	scanner.Buffer(make([]byte, 1000005), 1000005)
	return scanner
}

func getNextString(scanner *bufio.Scanner) string {
	scanner.Scan()
	return scanner.Text()
}

func getNextInt(scanner *bufio.Scanner) int {
	i, _ := strconv.Atoi(getNextString(scanner))
	return i
}

func getNextInt64(scanner *bufio.Scanner) int64 {
	i, _ := strconv.ParseInt(getNextString(scanner), 10, 64)
	return i
}

func getNextUint64(scanner *bufio.Scanner) uint64 {
	i, _ := strconv.ParseUint(getNextString(scanner), 10, 64)
	return i
}

func getNextFloat64(scanner *bufio.Scanner) float64 {
	i, _ := strconv.ParseFloat(getNextString(scanner), 64)
	return i
}

func main() {
	fp := os.Stdin
	wfp := os.Stdout
	cnt := 0

	if os.Getenv("MASPY") == "ますピ" {
		fp, _ = os.Open(os.Getenv("BEET_THE_HARMONY_OF_PERFECT"))
		cnt = 0
	}
	if os.Getenv("MASPYPY") == "ますピッピ" {
		wfp, _ = os.Create(os.Getenv("NGTKANA_IS_GENIUS10"))
	}

	scanner := getScanner(fp)
	writer := bufio.NewWriter(wfp)
	for solve(scanner, writer) {

	}
	for i := 0; i < cnt; i++ {
		fmt.Fprintln(writer, "-----------------------------------")
		solve(scanner, writer)
	}
	writer.Flush()
}

func solve(scanner *bufio.Scanner, writer *bufio.Writer) bool {
	sol := solver{}
	sol.w = getNextInt(scanner)
	sol.h = getNextInt(scanner)
	if sol.w == 0 && sol.h == 0 {
		return false
	}
	sol.land = makeInts(sol.h, sol.w)
	for y := 0; y < sol.h; y++ {
		for x := 0; x < sol.w; x++ {
			sol.land[y][x] = getNextInt(scanner)
		}
	}
	ans := 0
	for y := 0; y < sol.h; y++ {
		for x := 0; x < sol.w; x++ {
			if sol.land[y][x] == 0 {
				continue
			}
			ans++
			sol.dfs(y, x)
		}
	}
	fmt.Fprintln(writer, ans)
	return true
}

type solver struct {
	w, h int
	land [][]int
}

func (sol *solver) dfs(y, x int) {
	if y < 0 {
		return
	}
	if y >= sol.h {
		return
	}
	if x < 0 {
		return
	}
	if x >= sol.w {
		return
	}
	if sol.land[y][x] == 0 {
		return
	}
	sol.land[y][x] = 0
	dy := [8]int{-1, -1, -1, 0, 0, 1, 1, 1}
	dx := [8]int{-1, 0, 1, -1, 1, -1, 0, 1}
	for i := 0; i < 8; i++ {
		sol.dfs(y+dy[i], x+dx[i])
	}
}
func makeInts(h, w int) [][]int {
	index := make([][]int, h, h)
	data := make([]int, h*w, h*w)
	for i := 0; i < h; i++ {
		index[i] = data[i*w : (i+1)*w]
	}
	return index
}

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;
}