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>
using namespace std;
using ll=long long;
constexpr ll mod=1e9+7;
int w,h;
vector<vector<int>> field;
vector<vector<bool>> seen;

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

void dfs(pair<int,int> v)
{
  seen[v.first][v.second]=true;
  for (int i = 0; i < 8; ++i)
  {
    int nx=v.first+dx[i];
    int ny=v.second+dy[i];
    if(nx<0||nx>=h||ny<0||ny>=w) continue;
    if(field[nx][ny]==0) continue;
    if(seen[nx][ny]) continue;
    dfs({nx,ny});
  }
}

int main()
{while(true){
  
  cin>>w>>h;
  if(w==0&&h==0) break;
  field.resize(h);
  for (int i = 0; i < h; ++i)
  {
    field[i].resize(w);
    for (int j = 0; j < w; ++j)
    {
      cin>>field[i][j];
    }
  }
  seen=vector<vector<bool>>(h,vector<bool>(w,false));

  int cnt=0;
  for (int i = 0; i < h; ++i)
  {
    for (int j = 0; j < w; ++j)
    {
      if(seen[i][j]) continue;
      if(field[i][j]==0) continue;
      dfs({i,j});
      cnt++;
    }
  }
  cout<<cnt<<endl;
}}

C++: #include <bits/stdc++.h>
using namespace std;
#define FOR(i,a,b) for(int i=(a);i<(b);++i)
#define rep(i,n) FOR(i,0,n)
#define repr(i,n) for(int i=(n)-1;0<=i;--i)
#define each(e,v) for(auto&& e:(v))
#define all(v) begin(v),end(v)
#define dump(x) cerr<<#x<<": "<<(x)<<endl
#define INF 100000000
#define IINF 9999999999999;
using vint = vector<int>;
using ll = long long;
using vll = vector<ll>;
template <class T> void chmin(T& a, const T& b) { a = min(a, b); }
template <class T> void chmax(T& a, const T& b) { a = max(a, b); }

bool earth[51][51];

void erase_island(int h, int w) {
    earth[h][w] = false;
    //cout << "# " << h << " " << w << endl;
    if(earth[h - 1][w - 1]) erase_island(h - 1, w - 1);
    if(earth[h - 1][w]) erase_island(h - 1, w);
    if(earth[h - 1][w + 1]) erase_island(h - 1, w + 1);
    if(earth[h][w + 1]) erase_island(h, w + 1);
    if(earth[h + 1][w + 1]) erase_island(h + 1, w + 1);
    if(earth[h + 1][w]) erase_island(h + 1, w);
    if(earth[h + 1][w - 1]) erase_island(h + 1, w - 1);
    if(earth[h][w - 1]) erase_island(h, w - 1);
}

int main() {
    //ofstream outputfile("output.txt");
    while(true) {
        int w, h;
        cin >> w >> h;
        if(w == 0 && h == 0) break;
        rep(i, h) rep(j, w) {
                int temp;
                cin >> temp;
                if(temp == 0) earth[i][j] = false;
                else earth[i][j] = true;
            }

        int ans = 0;
        rep(i, h) rep(j, w) {
                if(earth[i][j]) erase_island(i , j), ++ans;
            }

        cout << ans << endl;
    }

    return 0;
}

C++: #include<bits/stdc++.h>
using namespace std;

int c[100][100];
int dx[] = { 0, 1, 1, 1, 0, -1, -1, -1 };
int dy[] = { -1, -1, 0, 1, 1, 1, 0, -1 };

void dfs(int x, int y){
	
	if (c[y][x] != 0){
		c[y][x] = 0;
		for (int i = 0; i < 8; i++){
			dfs(x + dx[i], y + dy[i]);
		}
	}

	return;
}

int main(){

	int w, h;

	while (cin >> w >> h, w, h){

		for (int j = 1; j <= h; j++){
			for (int i = 1; i <= w; i++){
				cin >> c[j][i];
			}
		}

		int result = 0;
		for (int j = 1; j <= h; j++){
			for (int i = 1; i <= w; i++){
				if (c[j][i] != 0) {
					dfs(i, j);
					result++;
				}
			}
		}

		cout << result << endl;

	}

	return 0;
}

//??????????????°??£????????????
//???????????±?????????????????????WA?????????
/*
int main(void){

	int w, h;

	while (cin >> w >> h, w, h){
		int c[100][100] = { 0 };
		vector<bool> island;
		island.push_back(false);

		for (int j = 1; j <= h; j++){
			for (int i = 1; i <= w; i++){
				cin >> c[j][i];
			}
		}

		int count = 1;
		for (int j = 1; j <= h; j++){
			for (int i = 1; i <= w; i++){
				if (c[j][i] != 0){

					if (c[j][i - 1] != 0) c[j][i] = c[j][i - 1];
					else if (c[j - 1][i + 1] != 0) c[j][i] = c[j - 1][i + 1];
					else if (c[j - 1][i] != 0) c[j][i] = c[j - 1][i];
					else if (c[j - 1][i - 1] != 0) c[j][i] = c[j - 1][i - 1];
					else{
						c[j][i] = count;
						count++;
						island.push_back(true);
					}

					bool buff = island[c[j][i]];

					island[c[j][i - 1]] = island[c[j - 1][i + 1]] = island[c[j - 1][i]] = island[c[j - 1][i - 1]] = false;
					island[c[j][i]] = buff && true;

				}
			}
		}

		int result = 0;
		vector<bool>::iterator it;
		for (it = island.begin(); it != island.end(); ++it) 	if (*it == true) result++;
		
		cout << result << endl;

	}

	return 0;
}
*/


/*
for(i=0;i<N;i++){
cin >> X[i];
}


for(i=0;i<N;i++){
for(j=0;j<N;j++){
cin >> X[i][j];
}
}
*/