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<iostream>
#include<cstdio>
using namespace std;
int field[52][52]={};
void umeru(int y,int x){
	field[y][x]=0;
	for(int i=-1;i<=1;i++){
		for(int j=-1;j<=1;j++){
			if(field[y+i][x+j])	umeru(y+i,x+j);
		}
	}
}
int main(){
	while(1){
		int w,h,cnt=0;
		cin >> w >> h;
		if(!w&&!h)	break;
		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++){
				if(field[i][j]){
					cnt++;
					umeru(i,j);
				}
			}
		}
		cout << cnt << endl;
	}
}

C++: #include <iostream>
#include <vector>

using namespace std;

#define vec vector
#define rep(i, n) for (int i = 0; i < (int)n; i++)

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

int dp[55][55];
int c[55][55];

int check(int x, int y)
{
	if (dp[x][y]) return 0;
	if (c[x][y] == 0) return 0;
	dp[x][y] = 1;
	
	rep(i, 8) {
		int xx = x + dx[i];
		int yy = y + dy[i];
		int take = check(xx, yy);
	}
	return 1;
}

int main(void)
{
	while(1) {
		int w, h;
		cin >> w >> h;
		if (w == 0) break;
		rep(i, 55) rep(j, 55) c[i + 1][j + 1] = 0;
		rep(i, h) rep (j, w) cin >> c[i + 1][j + 1];
		rep(i, 55) rep(j, 55) dp[i][j] = 0;
		rep(i, 55) {
			dp[0][i] = 1;
			dp[i][0] = 1;
			dp[h + 1][i] = 1;
			dp[i][w + 1] = 1;
		}

		int ans = 0;
		rep(i, h) rep(j, w) if (c[i + 1][j + 1]) ans += check(i + 1, j + 1);
		cout << ans << endl;
	}
	return 0;
}

C++: #include <algorithm>
#include <climits>
#include <cmath>
#include <cstdio>
#include <cstring>
#include <iostream>
#include <queue>
#include <stack>
#include <string>
#include <vector>
#define INF 10000000
#define PI 3.14159265358979323846
using namespace std;
typedef long long ll;
typedef pair<int, int> p;
typedef vector<int> v;
typedef vector<int, int> v2;
typedef vector< pair<int, int> > vp;
int dx[4] = { 0, 1, 0, -1 };
int dy[4] = { 1, 0, -1, 0 };

int w, h;
int c[50][50];
int f[50][50];

bool dfs(int y, int x){
	if (c[y][x] == 0) return false;
	if (f[y][x] == 1) return false;
	
	f[y][x] = 1;
	if (y > 0) dfs(y - 1, x);
	if (x > 0) dfs(y, x - 1);
	
	if (y < h) dfs(y + 1, x);
	if (x < w) dfs(y, x + 1);

	if (y > 0 && x > 0) dfs(y - 1, x - 1);
	if (y < h && x > 0) dfs(y + 1, x - 1);
	if (y > 0 && x < w) dfs(y - 1, x + 1);
	if (y < h && x < w) dfs(y + 1, x + 1);

	return true;
}

int main(){
	ios::sync_with_stdio(false);

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

		int ans = 0;

		for (int i = 0; i < h; i++)
			for (int j = 0; j < w; j++)
				cin >> c[i][j];
			
		for (int i = 0; i < h; i++)
			for (int j = 0; j < w; j++)
				f[i][j] = -1;
		
		for (int i = 0; i < h; i++)
			for (int j = 0; j < w; j++)
				if(dfs(i, j)) ans++;

		cout << ans << endl;

	}

	return 0;
}

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

int Count;
int w,h;
bool area[51][51]={};
int dx[8]={0,1,1,1,0,-1,-1,-1};
int dy[8]={1,1,0,-1,-1,-1,0,1};

void bfs(int x,int y){
  int X,Y;
  queue<pair<int,int> > Q;
  Q.push(make_pair(x,y));
  area[x][y]=0;
  while(!Q.empty()){
    pair<int,int> p1=Q.front();
    X=p1.first;
    Y=p1.second;
    Q.pop();
    for(int i=0;i<8;i++){
      if((X+dx[i]<=-1||Y+dy[i]<=-1)||(X+dx[i]>=w||Y+dy[i]>=h))continue;
      if(area[X+dx[i]][Y+dy[i]]==1){
        Q.push(make_pair(X+dx[i],Y+dy[i]));
        area[X+dx[i]][Y+dy[i]]=0;
      }
    }
  } 
  return;
}

int main(){
  int I;
  while(cin>>w>>h,w){
    Count=0;
    for(int i=0;i<h;i++){
      for(int j=0;j<w;j++){
        cin>>I;
        area[j][i]=I;
      }
    }

    for(int i=0;i<h;i++){
      for(int j=0;j<w;j++){
        if(area[j][i]==1){
          bfs(j,i);
          Count++;
        }
      }
    }
    cout<<Count<<endl;
  }
  return 0;
}