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<cstdio>
#include<cstdlib>
#include<cstring>
#include<cmath>
#include<cassert>
#include<iostream>
#include<sstream>
#include<string>
#include<vector>
#include<queue>
#include<set>
#include<map>
#include<utility>
#include<numeric>
#include<algorithm>
#include<bitset>
#include<complex>

using namespace std;

typedef long long Int;
typedef vector<int> vint;
typedef pair<int,int> pint;
#define mp make_pair

template<class T> void pv(T a, T b) { for (T i = a; i != b; ++i) cout << *i << " "; cout << endl; }
template<class T> void chmin(T &t, T f) { if (t > f) t = f; }
template<class T> void chmax(T &t, T f) { if (t < f) t = f; }
int in() { int x; scanf("%d", &x); return x; }

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

void f(int x,int y){
//cout<<x<<" "<<y<<endl;
	int i,j;
/*for(i=0;i<h;i++){
	for(j=0;j<w;j++){
		cout<<sea[i][j]<<" ";
	}
	cout<<endl;
}*/
	sea[y][x]=0;
	for(i=-1;i<2;i++){
		for(j=-1;j<2;j++){
			if(y+i<0||h<=y+i||x+j<0||w<=y+i)continue;
			if(sea[y+i][x+j]==1)f(x+j,y+i);
		}
	}
}

int main() {
	while(w=in(),h=in()){
		int i,j;
		for(i=0;i<h;i++){
			for(j=0;j<w;j++){
				cin>>sea[i][j];
			}
		}
		/*for(i=0;i<h;i++){
			for(j=0;j<w;j++){
				cout<<sea[i][j]<<" ";
			}
			cout<<endl;
		}*/
		int res=0;
		for(i=0;i<h;i++){
			for(j=0;j<w;j++){
				if(sea[i][j]==1){
					f(j,i);
					res++;
				}
			}
		}
		cout<<res<<endl;
	}
	return 0;
}

C++: #include <bits/stdc++.h>
using namespace std;
#define int long long
#define Rep(i, N) for(int i = 0; i < N; i++)

typedef pair<int, int> Pi;
#define fi first
#define se second

int mx[] = {1, 1, 0, -1, -1, -1, 0, 1};
int my[] = {0, 1, 1, 1, 0, -1, -1, -1};
int W, H;
int mas[55][55];

void bfs(int sy, int sx) {
  
  queue < Pi > que;
  que.push(Pi(sy, sx));

  while(!que.empty()) {
    Pi d = que.front(); que.pop();
    int y = d.fi, x = d.se;
    Rep(i, 8) {
      int ny = y + my[i], nx = x + mx[i];
      if(ny < 0 || nx < 0 || ny >= H || nx >= W || !mas[ny][nx]) continue;
      mas[ny][nx] = 0; bfs(ny, nx);
    }
  }
}

signed main()
{  
  while(cin >> W >> H, W || H) {
    int ans = 0;
    Rep(i, H) Rep(j, W) cin >> mas[i][j];

    Rep(i, H) Rep(j, W) {
      if(mas[i][j]) {
	mas[i][j] = 0, ans++;
	bfs(i, j);
      }
    }

    cout << ans << endl;
  }
}

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

int myMap[51][51];
int w, h;
int ans;

bool safe(int x, int y){
    return (0 <= x && 0 <= y) && (x < h && y < w);
}

void del(int x, int y){
    myMap[x][y] = 0;
    if (safe(x+1, y) && myMap[x+1][y]) del(x+1, y);
    if (safe(x+1, y+1) && myMap[x+1][y+1]) del(x+1, y+1);
    if (safe(x+1, y-1) && myMap[x+1][y-1]) del(x+1, y-1);
    if (safe(x, y+1) && myMap[x][y+1]) del(x, y+1);
    if (safe(x, y-1) && myMap[x][y-1]) del(x, y-1);
    if (safe(x-1, y-1) && myMap[x-1][y-1]) del(x-1, y-1);
    if (safe(x-1, y+1) && myMap[x-1][y+1]) del(x-1, y+1);
    if (safe(x-1, y) && myMap[x-1][y]) del(x-1, y);
    return;
}

int main(){

    while (1){
	cin >> w >> h;
	if (w == 0 && h == 0) break;

	for (int i = 0; i < h; i++){
	    for (int j = 0; j < w; j++){
		cin >> myMap[i][j];
	    }
	}

	ans = 0;	
	for (int i = 0; i < h; i++){
	    for (int j = 0; j < w; j++){
		if (myMap[i][j] == 1){
		    ans++;
		    del(i, j);
		}
	    }
	}

	cout << ans << endl;
    }
}

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

void ume(int y, int x, vector<vector<int>> &field) {
    int dx[] = {1, 1, 1, 0, 0, -1, -1, -1};
    int dy[] = {0, 1, -1, 1, -1, 0, 1, -1};

    for (int d = 0; d < 8; d++) {
        if (field[y + dy[d]][x + dx[d]] == 1) {
            field[y + dy[d]][x + dx[d]] = 0;
            ume(y + dy[d], x + dx[d], field);
        }
    }
}

int solve(int w, int h) {
    vector<vector<int>> field(h + 2, vector<int>(w + 2, 0));
    for (int i = 0; i < h + 2; i++) {
        for (int j = 0; j < w + 2; j++) {
            if (i == 0 || i == h + 1 || j == 0 || j == w + 1)
                field[i][j] = -1;
            else
                cin >> field[i][j];
        }
    }
    // for (int i = 0; i < h + 2; i++) {
    //     for (int j = 0; j < w + 2; j++) {
    //         // if (i == 0 || i == h + 1 || j == 0 || j == w + 1)
    //         //     field[i][j] = -1;
    //         // else
    //         //     cin >> field[i][j];
    //         cout << field[i][j] << " ";
    //     }
    //     cout << endl;
    // }

    // queue<pair<int,int>> que;
    int island = 0;
    for (int i = 0; i < h + 2; i++) {
        for (int j = 0; j < w + 2; j++) {
            if (field[i][j] == 1) {
                field[i][j] = 0;
                ume(i, j, field);
                island++;
            }
        }
    }
    return island;
}

int main(void) {
    int w, h;
    vector<int> ans;
    while (1) {
        cin >> w >> h;
        if (!w && !h) break;
        ans.push_back(solve(w, h));
    }
    for (int a : ans) cout << a << endl;
}