Go: package main

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

var (
	readString func() string
	readBytes  func() []byte
	stdout     *bufio.Writer
)

func init() {
	readString, readBytes = newReadString(os.Stdin)
	stdout = bufio.NewWriter(os.Stdout)
}

func newReadString(ior io.Reader) (func() string, func() []byte) {
	r := bufio.NewScanner(ior)
	r.Buffer(make([]byte, 1024), math.MaxInt32)
	r.Split(bufio.ScanWords)

	f1 := func() string {
		if !r.Scan() {
			panic("Scan failed")
		}
		return r.Text()
	}
	f2 := func() []byte {
		return []byte(f1())
	}
	return f1, f2
}

func readInt() int {
	return int(readInt64())
}

func readInt64() int64 {
	i, err := strconv.ParseInt(readString(), 10, 64)
	if err != nil {
		panic(err.Error())
	}
	return i
}

func readFloat64() float64 {
	f, err := strconv.ParseFloat(readString(), 64)
	if err != nil {
		panic(err.Error())
	}
	return f
}

func printf(f string, args ...interface{}) (int, error) {
	return fmt.Fprintf(stdout, f, args...)
}

func println(args ...interface{}) (int, error) {
	return fmt.Fprintln(stdout, args...)
}

func eprintln(args ...interface{}) (int, error) {
	return fmt.Fprintln(os.Stderr, args...)
}

func eprintf(f string, args ...interface{}) (int, error) {
	return fmt.Fprintf(os.Stderr, f, args...)
}

func min(a, b int) int {
	if a < b {
		return a
	}
	return b
}

func min64(a, b int64) int64 {
	if a < b {
		return a
	}
	return b
}

func max(a, b int) int {
	if a < b {
		return b
	}
	return a
}

func max64(a, b int64) int64 {
	if a < b {
		return b
	}
	return a
}

func abs(a int) int {
	if a < 0 {
		return -a
	}
	return a
}

func abs64(a int64) int64 {
	if a < 0 {
		return -a
	}
	return a
}

func gcd(a, b int) int {
	if b == 0 {
		return a
	}
	return gcd(b, a%b)
}

func gcd64(a, b int64) int64 {
	if b == 0 {
		return a
	}
	return gcd64(b, a%b)
}

// readString() string
// readInt() int
// readInt64() int64
// readFloat64() float64

// -----------------------------------------------------------------------------

func main() {
	defer stdout.Flush()

	for {
		ans, ok := solve()
		if !ok {
			break
		}
		println(ans)
	}

}

func solve() (int, bool) {
	w := readInt()
	h := readInt()
	if w == 0 && h == 0 {
		return 0, false
	}

	c := make([][]int, h+2)
	c[0] = make([]int, w+2)
	c[h+1] = make([]int, w+2)
	for i := 1; i-1 < h; i++ {
		c[i] = make([]int, w+2)
		for j := 1; j-1 < w; j++ {
			c[i][j] = readInt()
		}
	}

	var ans int
	for i := 1; i-1 < h; i++ {
		for j := 1; j-1 < w; j++ {
			if 0 < c[i][j] {
				ans++
				dfs(c, i, j)
			}
		}
	}
	return ans, true
}

func dfs(c [][]int, y, x int) {
	c[y][x] = 0
	dx := []int{-1, 0, 1, -1, 1, -1, 0, 1}
	dy := []int{-1, -1, -1, 0, 0, 1, 1, 1}
	for i := range dx {
		nx := x + dx[i]
		ny := y + dy[i]
		if 0 < c[ny][nx] {
			dfs(c, ny, nx)
		}
	}
}

// -----------------------------------------------------------------------------

C++: #include <bits/stdc++.h>
typedef long long ll;
#define ALL(l)  (l).begin(),(l).end()
#define rep(i,n) for(ll (i)=0;(i)<(n);(i)++)
#define rep2(i, s, n) for (ll i = (s); i < (ll)(n); i++)
using namespace std;

//const ll mod =  1000000007;
//const ll maxn = 1000000000;

//---------------------------------------------------------------------------------------------------
using vi = vector<int>; // intの1次元の型に vi という別名をつける
using vll = vector<ll>; // intの1次元の型に vi という別名をつける
using vvll = vector<vll>; // intの2次元の型に vvi という別名をつける
using vs = vector<string>; // stringの1次元の型に vs という別名をつける
using pll = pair<ll, ll>; // これ以降 pii という型名はpair<ll, ll> と同じ意味で使える
//---------------------------------------------------------------------------------------------------

int w,h;
vvll a(50,vll(50));

void dfs(int x,int y){
     a.at(x).at(y)=0;
     rep2(dx,-1,2){
       rep2(dy,-1,2){
         int  nx=x+dx;
         int  ny=y+dy;
           if(0<=nx&&nx<h&&0<=ny&&ny<w){
                if(a.at(nx).at(ny)==1){
                    dfs(nx,ny) ;         
                           }
                       }
                   }
               }                                  
}


int main() {
   while(1){
   cin>>w>>h;
   if(w==0&&h==0)break;
   else{
   rep(i,h){
       rep(j,w)cin>>a.at(i).at(j);
   }
  
   int ans=0;
   rep(i,h){
       rep(j,w){
           if(a.at(i).at(j)==1){
               
               
               dfs(i,j);
               ans++;
               
           }
       }
   }
   
  
   cout<<ans<<endl;
   }
   }
    
}

C++: #include<iostream>
#include<stack>
using namespace std;
int dx[8]={0,1,1,1,0,-1,-1,-1};
int dy[8]={-1,-1,0,1,1,1,0,-1};
int main()
{
	int n,m;
	while(cin>>n>>m,n) 
	{
		int f[m][n];
		for(int i = 0; i < m; ++i)
		{
			for(int j = 0; j < n; ++j)
			{
				cin>>f[i][j];
			}
		}

		int ans=0;
		for(int i = 0; i < m; ++i)
		{
			for(int j = 0; j < n; ++j)
			{
				if(f[i][j]==1)
				{
					ans++;
					stack<int> xs,ys;
					xs.push(j); ys.push(i);
					while(!xs.empty()) 
					{
						int x=xs.top(),y=ys.top();
						xs.pop(); ys.pop();
						f[y][x]=0;
						for(int k = 0; k < 8; ++k)
						{
							int nx=x+dx[k],ny=y+dy[k];
							if(0<=nx&&nx<n&&0<=y&&y<m&&f[ny][nx]==1)
							{
								xs.push(nx); ys.push(ny);
							}
						}
					}
				}
			}
		}
		cout<<ans<<endl;
	}
  return 0;
}

C++: #include <bits/stdc++.h>
#define INF 1e18
#define int long long
#define Rep(i, a, n) for (int i = (a); i < (n); i++)
#define Repr(i, n, a) for (int i = (n); i >= (a); i--)
#define rep(i, n) Rep(i, 0, n)
#define repr(i, n) Repr(i, n, 0)
#define all(a) a.begin(), a.end()
using namespace std;
typedef pair<int, int> P;
typedef pair<int, P> PP;
const int mod = 1000000007;

int w, h;
int c[60][60];

void solve(int x, int y)
{
    if (x < 0 || h <= x || y < 0 || w <= y)
        return;
    if (c[x][y] == 0)
        return;
    c[x][y] = 0;
    for (int i = -1; i < 2; i++)
    {
        for (int j = -1; j < 2; j++)
        {
            solve(x + i, y + j);
        }
    }
}

signed main()
{
    ios::sync_with_stdio(false);
    cin.tie(0);

    while (1)
    {
        cin >> w >> h;
        if (h == 0)
            break;
        rep(i, h)
        {
            rep(j, w)
            {
                cin >> c[i][j];
            }
        }
        int ans = 0;
        rep(i, h)
        {
            rep(j, w)
            {
                if (c[i][j] == 1)
                {
                    solve(i, j);
                    ans++;
                }
            }
        }
        cout << ans << endl;
    }
}

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

int map[50][50];

typedef pair<int, int> pxy;

int h, w, ans = 0;

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

void bfs(int sx, int sy)
{
  queue<pxy> q;
  q.push(pxy(sx, sy)); 
  while(!q.empty()){
    int x, y;
    x = q.front().first;
    y = q.front().second;
    q.pop();
    if(map[x][y]){
      map[x][y] = 0;
      for(int i = 0; i < 8; i++){
	int next_x = x + dx[i], next_y = y + dy[i];
	if(map[next_x][next_y] && next_x < w && next_x >= 0 && next_y < h && next_y >= 0){
	  q.push(pxy(next_x, next_y));
	}
      }
    }
  }
}

int main()
{
  while(1){
    cin >> w >> h;
    if(w == 0 && h == 0){
      break;
    }else{
      for(int i = 0; i < h; i++)
	for(int j = 0; j < w; j++)
	  cin >> map[j][i];
      for(int i = 0; i < h; i++)
	for(int j = 0; j < w; j++)
	  if(map[j][i]){
	    ans++;
	    bfs(j, i);
	  }
      cout << ans << endl;
      ans = 0;
    }
  }
}