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 <iostream>
#include <vector>
#include <string>

using namespace std;

void search(int w, int h, const vector< vector<int> >& area_map, vector< vector<int> >& visited, int W, int H) {
    visited[h][w] = 1;
    int dw[] = {1, 1, 0, -1, -1, -1, 0, 1}, dh[] = {0, 1, 1, 1, 0, -1, -1, -1};
    for(int i = 0; i < 8; i++) {
        int nw = w + dw[i], nh = h + dh[i];
        if(0 <= nw && nw < W && 0 <= nh && nh < H && visited[nh][nw] != 1 && area_map[nh][nw] == 1) {
            search(nw, nh, area_map, visited, W, H);
        }
    }
}

int main() {
    while(true) {
        int w, h; 
        cin >> w >> h;
        if(w == 0 && h == 0) break;

        vector< vector<int> > area_map, visited;
        for(int i = 0; i < h; i++) {
            vector<int> temp;
            for(int j = 0; j < w; j++) {
                int e; cin >> e;
                temp.push_back(e);
            }
            area_map.push_back(temp);
            visited.push_back(vector<int>(w));
        }
        int ans = 0;
        for(int i = 0; i < h; i++) {
            for(int j = 0; j < w; j++) {
                if(area_map[i][j] == 1 && visited[i][j] != 1) {
                    search(j, i, area_map, visited, w, h);
                    ans++;
                }
            }
        }
        cout << ans << endl;
    }
}

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

int h,w;

int v[50][50];

int dx[8]={0,1,1,1,0,-1,-1,-1};
int dy[8]={-1,-1,0,1,1,1,0,-1};

void calc(int y,int x){
	if(v[y][x]==0) return;
	v[y][x]=0;
	for(int r=0;r<8;r++){
		int nx=x+dx[r],ny=y+dy[r];
		if(nx<0 || ny<0 || nx>=w || ny>=h)
			continue;
		calc(ny,nx);
	}
}


void solve()
{
	memset(v,0,sizeof(v));
	for(int y=0;y<h;y++){
		for(int x=0;x<w;x++){
			int t;cin>>t;v[y][x]=t;
		}
	}
	int res=0;

	for(int y=0;y<h;y++)
		for(int x=0;x<w;x++){
			if(v[y][x]==0) continue;
			res++;
			calc(y,x);
		}
		cout<<res<<endl;
}



int main()
{
	while(cin>>w>>h){
		if(w==0) break;
		solve();
	}
	return 0;
}

C++: #include <iostream>
#include <string>
#include <vector>
#include <queue>
#include <set>
#include <map>
#include <utility>
#include <stack>
#include <numeric>
#include <algorithm>
#include <stdio.h>
#include <bitset>
#include <complex>
#include <iomanip>
using namespace std;
//using ll = long long;
#define MM 1000000000
#define MOD MM+7
#define pi pair<int32,int32>
#define pl pair<int64,int64>
#define chmax(a,b) (a<b ? a=b:0)
#define chmin(a,b) (a>b ? a=b:0)
const long double PI = acos(-1);
const long long INF = 1e15;
int dx[8] = {-1,0,1,0,-1,-1,1,1};
int dy[8] = {0,-1,0,1,-1,1,1,-1};
template<typename T>
T GCD(T u,T v){
    return v ? GCD(v,u%v) : u;
}
int c[50][50];
int visited[50][50];
void init(int h,int w){
    for(int i = 0; i < 50; i++){
        for(int j = 0; j < 50; j++){
            visited[i][j] = false;
            c[i][j] = 0;
        }
    }
}
void dfs(int h,int w,int H,int W){
    visited[h][w] = true;
    for(int i = 0; i < 8; i++){
        int ny = h+dy[i];
        int nx = w+dx[i];
        if (0 <= ny && ny < H && 0 <= nx && nx < W && visited[ny][nx] == false && c[ny][nx] == 1){
            dfs(ny,nx,H,W);
        }
    }
    return;
}
int main(){
    vector<int> ans(0);
    for(;;){
        int H,W; cin >> W >> H;
        if(H == 0 && W == 0) break;
        init(H,W);
        for(int h = 0; h < H; h++){
            for(int w = 0; w < W; w++){
                cin >> c[h][w];
            }
        }
        int cnt = 0;
        for(int h = 0; h < H; h++){
            for(int w = 0; w < W; w++){
                if (c[h][w] == 1 && visited[h][w] == false){
                    dfs(h,w,H,W);
                    cnt++;
                }
            }
        }
        /* 
        for(int i = 0; i < H; i++){
            for(int j = 0; j < W; j++){
                cout << visited[i][j] << " ";
            }
            cout << endl;
        }
        */
        ans.push_back(cnt);
    }
    for(int i = 0; i < ans.size(); i++){
        cout << ans[i] << endl;
    }
}