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++: // http://judge.u-aizu.ac.jp/onlinejudge/description.jsp?id=1160

#include <iostream>
#include <algorithm>
#include <stack>
using namespace std;

int w, h;
bool F[60][60];

struct point {
  int x, y;
};

void init() {
  fill(&F[0][0], &F[0][0]+60*60, 0);
  for (int i=1; i<=h; i++) {
    for (int j=1; j<=w; j++) {
      int temp;
      scanf("%d", &temp);
      F[i][j] = (bool) temp;
    }
  }
}

int solve() {
  int ans = 0;
  for (int i=1; i<=h; i++) {
    for (int j=1; j<=w; j++) {
      if (F[i][j]) {
	stack<point> S;
	point p = { i, j };
	S.push(p);
	while (! S.empty()) {
	  p = S.top();
	  S.pop();
	  F[p.x][p.y] = false;
	  for (int i=-1; i<=1; i++) {
	    for (int j=-1; j<=1; j++) {
	      point q = { p.x + i , p.y + j };
	      if (F[q.x][q.y]) {
		S.push(q);
	      }
	    }
	  }
	}
	ans++;
      }
    }
  }
  return ans;
}

int main() {
  while(scanf("%d%d", &w, &h) != EOF && w && h) {
    init();
    printf("%d\n", solve());
  }
}

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

int state[100][100];
bool reached[100][100];
int w,h;

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

void dfs(int x, int y) {

	if(x==0 || w<x || y==0 || h<y || state[x][y] == 0)
		return;
	if(reached[x][y] == true)
		return;

	reached[x][y]=true;

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

int main() {

	while(cin >> w >> h,w){
		memset(state, 0, sizeof(state));
		memset(reached, false, sizeof(reached));
		for(int i=1; i<=h; i++) {
			for(int j=1; j<=w; j++) {
				cin >> state[i][j];
			}
		}
		int count=0;
		for(int i=1; i<=w; i++) {
			for(int j=1; j<=h; j++) {
				if(reached[i][j]==true || state[i][j] == 0)
					continue;
				else{
					dfs(i,j);
					count++;
				}
			}
		}
		cout << count << endl;
	}
	return 0;
}

C++: #include <iostream>
#define MAXSIZE 50

using namespace std;

int cnt;
int island[MAXSIZE][MAXSIZE];

int check(int x, int y, int w, int h);

int main(int argc, char const *argv[])
{
	int w, h;

	while(cin >> w >> h, w | h)
	{
		for(int i = 0; i < h; i++)
		{
			for(int j = 0; j < w; j++)
			{
				cin >> island[i][j];
			}
		}

		/* processor */	
		cnt = 0;

		for(int x = 0; x < w; x++)
		{
			for(int y = 0; y < h; y++)
			{
				if(check(x, y, w, h))
				{
					cnt++;
				}
			}
		}

		cout << cnt << endl;
	}	

	return 0;
}

int check(int x, int y, int w, int h)
{
	int dx[] = {-1, 0, 1, 1, 1, 0, -1, -1};
	int dy[] = {-1, -1, -1, 0, 1, 1, 1, 0};

	if(island[y][x])
	{
		island[y][x] = 0;

		for(int i = 0; i < 8; i++)
		{
			if(x + dx[i] < 0 || x + dx[i] >= w || y + dy[i] < 0 || y + dy[i] >= h)
			{
				continue;
			}

			check(x + dx[i], y + dy[i], w, h);
		}

		return 1;
	}

	return 0;
}

C++: #include "iostream"
#include "climits"
#include "list"
#include "queue"
#include "stack"
#include "set"
#include "functional"
#include "algorithm"
#include "string"
#include "map"
#include "iomanip"
#include "random"

using namespace std;

const long long int MOD = 1000000007;
const long double EPS = 0.00000001;
const long double PI = 3.1415926535897932384626433;

long long int N, M, K, H, W, L, R;


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

	cin >> W>>H;
	while (H) {
		N = 0;
		vector<vector<int>>field(H + 2, vector<int>(W + 2, 0));
		for (int i = 1; i <= H; i++) {
			for (int j = 1; j <= W; j++) {
				cin >> field[i][j];
			}
		}
		for (int i = 1; i <= H; i++) {
			for (int j = 1; j <= W; j++) {
				queue<pair<int, int>>Q;
				if (field[i][j]) {
					field[i][j] = 0;
					Q.push({ i,j });
					N++;
					while (!Q.empty()) {
						int cy = Q.front().first;
						int cx = Q.front().second;
						//cout << N << " " << cy << " " << cx << endl;
						Q.pop();
						
						for (int k = -1; k <= 1; k++) {
							for (int l = -1; l <= 1; l++) {
								if (field[cy + k][cx + l]) {
									field[cy + k][cx + l] = 0;
									Q.push({ cy + k,cx + l });
								}
							}
						}
					}
				}
			}
		}
		cout << N << endl;
		cin >> W >> H;
	}
	return 0;
}