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>
#define rep(i, n) for (int i = 0; i < (int)(n); i++)
using namespace std;
using ll = long long;
using P = pair<int, int>;

int w, h;

vector<vector<int>> field(55, vector<int>(55));
vector<vector<int>> island(55, vector<int>(55, -1));

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

void dfs(int y, int x, int id) {
    island[y][x] = id;
    rep(i, 8) {
        int ny = y + dy[i]; int nx = x + dx[i];
        if (ny < 0 || ny >= h || nx < 0 || nx >= w || field[ny][nx] == 0) continue;
        if (island[ny][nx] != -1) continue;
        dfs(ny, nx, id);
    }
}

int main() {
    
    while (cin >> w >> h && w) {
        rep(i, h) {
            rep(j, w) { 
                cin >> field[i][j];
            }
        }

        rep(i, h) {
            rep(j, w) {
                island[i][j] = -1;
            }
        }

        int ans = 0;
        rep(y, h) {
            rep(x, w) {
                if (field[y][x] == 1 && island[y][x] == -1) {
                    dfs(y, x, ans);
                    ans++;
                } 
            }
        }
        cout << ans << endl;
    }
    return 0;
}

C++: #include<stdio.h>
#include<iostream>

int field[51][51];

void land(int x,int y){
	field[x][y]=0;

	for(int yy=-1;yy<=1;yy++){
		for(int xx=-1;xx<=1;xx++){
			if(field[x+xx][y+yy]==1) land(x+xx,y+yy);
		}
	}
	return;
}

int main(void){

	int w,h,kazu=0;

	scanf("%d %d",&w,&h);

	if(w==0||h==0) return 0;

	for(int i=0;i<h;i++){
		for(int j=0;j<w;j++){
			scanf("%d",&field[j][i]);
		}
	}

	for(int i=0;i<h;i++){
		for(int j=0;j<w;j++){

			if(field[j][i]==1){
				land(i,j);
				kazu++;
			}

		}
	}

	printf("%d",kazu);
	return 0;
}

C++: #include <bits/stdc++.h>
using namespace std;
#define REP(i,n) for(int (i) = 0;(i) < (n) ; ++(i))
#define REPS(a,i,n) for(int (i) = (a) ; (i) < (n) ; ++(i))
#define REVERSE(i,n) for(int (i) = n-1;(i) >= 0 ; --i)
#define ALL(c) (c).begin() , (c).end()
#define LL long long
#define int LL
#define inf  (1LL << 60)
#define mod 1000000007
#define QUICK_CIN ios::sync_with_stdio(false); cin.tie(0);
#define lower lower_bound
#define upper upper_bound
#define ZERO(c,n) memset(&c[0],0,sizeof(int)*n)
#define ZERO2(c,n) memset(&c[0][0],0,sizeof(int)*n
#define pl(a) cout << ""#a": " << a << endl;
#ifdef _DEBUG
#define debug_io fstream cin("input.txt");ofstream cout("output.txt");
template<class T>fstream& operator>>(fstream& is, vector<T>& v)
{
	int n = v.size();
	REP(i, n) {
		is >> v[i];
	}
	return is;
}
#else
#define debug_io ;
#endif
#define debug_input debug_io
#define DOWN(T) std::greater<T>()
template<class T>istream& operator>>(istream& is, vector<T>& v)
{
	int n = v.size();
	REP(i, n) {
		is >> v[i];
	}
	return is;
}
using vs = vector<string>; using vi = vector<int>; using pii = pair<int, int>;
using psi = pair<string, int>; using vvi = vector<vi>; using pss = pair<string, string>;
using vpii = vector<pii>;
template<class T>bool valid(T x, T w) { return 0 <= x&&x < w; }
//int dx[4] = { 1, -1, 0, 0 }; int dy[4] = { 0, 0, 1, -1 };
//-----------------------------------------------------------------------------------------------
//-----------------------------------------------------------------------------------------------
//-----------------------------------------------------------------------------------------------

bool ed[55][55];
int dx[8] = { 0,0,1,-1,1,-1,1,-1 };
int dy[8] = { 1,-1,0,0,1,1,-1,-1 };

signed main()
{
	QUICK_CIN;
	debug_input;
	int w, h;
	while (cin >> w >> h, w + h) {
		vector<vi> tile(h,vi(w));
		REP(i, h) {
			REP(j, w) {
				cin >> tile[i][j];
			}
		}

		int ans = 0;
		REP(i, 55) {
			REP(j, 55) {
				ed[i][j] = false;
			}
		}

		REP(i, h) {
			REP(j, w) {
				if (tile[i][j] != 1)
					continue;
				queue<pii> q;
				q.push({ i,j });
				while (q.size()) {
					auto t = q.front();
					q.pop();
					auto y = t.first;
					auto x = t.second;
					if (ed[y][x]) {
						continue;
					}
					tile[y][x] = 2;
					ed[y][x] = true;
					REP(k, 8) {
						auto nx = min(w-1,max(0LL,x + dx[k]));
						auto ny = min(h-1,max(0LL,y + dy[k]));
						if (!ed[ny][nx]&&tile[ny][nx]==1) {
							q.push({ ny,nx });
						}
					}
				}
				ans++;
			}
		}
		cout << ans << endl;
	}
}

C++: #include <bits/stdc++.h>
using namespace std;
#define rep(i,n) for(int i=0;i<n;i++)
#define REP(i,n) for(int i=1;i<=n;i++)
typedef long long ll;

int field[55][55];

int dx[4] = {1,0,-1,0};
int dy[4] = {0, 1, 0, -1};

int w,h;

void dfs(int i, int j){
	field[i][j] = 0;
	for (int k = -1; k <= 1; ++k) {
		for (int l = -1; l <= 1 ; ++l) {
			if(k == 0 && l == 0) continue;
			int x = j + k;
			int y = i + l;
			if(x<0 || x>= w || y<0 || y>=h) continue;
			if(field[y][x] == 1){
				dfs(y,x);
			}
		}
	}
	return ;
}

int main(){
	cin >> w >> h;
	
	while(w != 0 || h != 0) {
		rep(i, h) {
			rep(j, w) {
				cin >> field[i][j];
			}
		}
		
		int ans = 0;
		
		rep(i, h) {
			rep(j, w) {
				if (field[i][j] == 1) {
					dfs(i, j);
					ans++;
				}
			}
		}
		
		cout << ans << endl;
		cin >> w >> h;
	}
    return 0;
}