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 <stdio.h>
#include <iostream>

using namespace std;

int c[51][51];

void deep(int i,int n){
  if(c[i][n+1]==1){
    c[i][n+1]=2;
    deep(i,n+1);
  }
  if(c[i+1][n]==1){
    c[i+1][n]=2;
    deep(i+1,n);
  }
  if(c[i][n-1]==1){
    c[i][n-1]=2;
    deep(i,n-1);
  }
  if(c[i-1][n]==1){
    c[i-1][n]=2;
    deep(i-1,n);
  }
  if(c[i+1][n+1]==1){
    c[i+1][n+1]=2;
    deep(i+1,n+1);
  }
  if(c[i+1][n-1]==1){
    c[i+1][n-1]=2;
    deep(i+1,n-1);
  }
  if(c[i-1][n+1]==1){
    c[i-1][n+1]=2;
    deep(i-1,n+1);
  }
  if(c[i-1][n-1]==1){
    c[i-1][n-1]=2;
    deep(i-1,n-1);
  }
}

int main(){
  while(1){
    for(int i=0;i<51;i++){
      for(int n=0;n<51;n++){
          c[i][n]=0;
      }
    }
    int w,h;
    int num=0;

    scanf("%d%d",&w,&h);
    if(w==0&&h==0)break;

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

    for(int i=0;i<h;i++){
      for(int n=0;n<w;n++){
          if(c[i][n]==1){
            num++;
            deep(i,n);
          }
      }
    }

    printf("%d\n",num);
  }
  return 0;
}

C++: #include<bits/stdc++.h>
#include<string>
#include<vector>
using namespace std;
typedef pair<int, int>P;
typedef long long ll;
#define rep(i,n)for(ll i=0;i<n;++i)
#define exrep(i, a, b) for(ll i = a; i <= b; i++)
#define out(x) cout << x << endl
#define exout(x) printf("%.10f\n", x)
#define chmax(x, y) x = max(x, y)
#define chmin(x, y) x = min(x, y)
#define all(a) a.begin(), a.end()
#define rall(a) a.rbegin(), a.rend()
#define pb push_back
#define re0 return 0
const ll mod = 1000000007;
const ll INF = 1e16;
const ll MAX_N = 100010;
//max=({});
//条件式が真ならwhileの中身を回し続ける
//printf("%d\n", ans);

//pairの入力
//vector<pair<ll, ll>>work(n);
//rep(i, n) {
//	ll a, b;
//	cin >> a >> b;
//	work[i] = make_pair(a, b);
//for(auto p:mp)(mapの探索)
//printf("%.10f\n",なんちゃら)
//最大公約数
ll gcd(ll x, ll y) {
	return y ? gcd(y, x % y) : x;
}

ll lcm(ll x, ll y) {
	if (x == 0 || y == 0)return 0;
	return (x / gcd(x, y) * y);
}

//素因数分解
map<ll, ll>ins;
void facterize(ll n) {
	ll a = 2;
	while (n >= a * a) {
		if (n % a == 0) {
			ins[a]++;
			ins[a] = ins[a] % 1000000007;
			n /= a;
		}
		else {
			a++;
		}
	}
	ins[n]++;
}

int keta(int x) {
	int y = 0;
	while (x > 0) {
		y++;
		x /= 10;
	}
	return y;
}

ll dx[8] = { 0,0,-1,1 };
ll dy[8] = { -1,1,0,0 };
ll dp[1010][1010];
ll land[101][101];
bool flag[101][101];
ll h, w;

void dfs(ll y, ll x) {
	flag[y][x] = false;
	for (ll dx = -1;dx <= 1;++dx) {
		for (ll dy = -1;dy <= 1;++dy) {
			if (0 <= y + dy && y + dy < h && 0 <= x + dx && x + dx < w && flag[y + dy][x + dx]) {
				dfs(y + dy, x + dx);
			}
		}
	}
	return;
}

//long longしか使わない
int main() {
	while (cin >> w >> h,w||h) {
		for (ll i = 0;i < h;++i) {
			for (ll j = 0;j < w;++j) {
				cin >> land[i][j];
				if (land[i][j])flag[i][j] = true;
			}
		}
		ll ans = 0;
		for (ll i = 0;i < h;++i) {
			for (ll j = 0;j < w;++j) {
				if (flag[i][j]) {
					dfs(i, j);
					ans++;
				}
			}
		}
		cout << ans << endl;
	}
	return 0;
}

C++: #include <iostream>
#include <iomanip>
#include <utility>
#include <cmath>
#include <random>
#include <vector>
#include <map>
#include <set>
#include <deque>
#include <queue>
#include <stack>
#include <string>
#include <algorithm>
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)
#define all(x) begin(x),end(x)
typedef long long ll;
typedef pair<int,int> ip;
typedef pair<ll,ll> lp;
const int inf = 1001001000;
const ll INF = 1LL<<60;
const int MOD = (int)1e9 + 7;

int d8x[8] = {0,1,1,1,0,-1,-1,-1};
int d8y[8] = {1,1,0,-1,-1,-1,0,1};

int m[55][55];
int w,h;

void dfs(int i, int j){
	m[i][j] = 0;
	rep(c,8){
		int dy = i+d8y[c], dx = j+d8x[c];
		if(1<=dx && dx<=w && 1<=dy && dy<=h && m[dy][dx] == 1){
			dfs(dy,dx);
		}
	}
	return ;
}

int main(){
	while(true){
		int ans = 0;
		cin>>w>>h;
		if(w == 0 && h == 0)break;
		REP(i,h)REP(j,w)cin>>m[i][j];
		REP(i,h)REP(j,w){
			if(m[i][j] == 1){
				++ans;
				dfs(i,j);
			}
		}
		cout<<ans<<endl;
	}
	return 0;
}