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++: //#define _GLIBCXX_DEBUG
#include <bits/stdc++.h>
using namespace std;
#define all(v) v.begin(), v.end()
using in = int64_t;
#define rep(i, n) for (int i = 0; i < (int)(n); i++)
#define REP(i,a,b) for(int i=(int)(a);i<(int)(b);i++)
const double PI=3.14159265358979323846;
const in MOD = 1000000007;
const in INF=1<<30;
using P=pair<int,int>;
vector<int> dx={0,1,-1,0,1,-1,1,-1};
vector<int> dy={1,0,0,-1,1,1,-1,-1};
vector<vector<int>> a(0);
int h,w;

void dfs(int x,int y){
    a[x][y]=0;
    rep(i,8){
        int nx=x+dx[i],ny=y+dy[i];
        if(nx>=h||nx<0||ny>=w||ny<0) continue;
        if(a[nx][ny]==0) continue;
        dfs(nx,ny);
    }
}

int main(){
ios::sync_with_stdio(0); cin.tie(0); cout.tie(0);
cout << fixed << setprecision(10);
    cin>>w>>h;
    vector<int> ans(0);
    while(h+w>0){
        int cnt=0;
        a=vector<vector<int>>(h,vector<int>(w));
        rep(i,h)rep(j,w) cin>>a[i][j];
        rep(i,h)rep(j,w){
            if(a[i][j]==1){dfs(i,j);cnt ++;}
        }
        cin>>w>>h;
        ans.emplace_back(cnt);
    }
    for(auto e:ans) cout<<e<<endl;
}

C++: #include <bits/stdc++.h>

using namespace std;

typedef long long int ll;
typedef pair<int,int> P;

#define rep(i,n) for(int i=0;i<(n);++i)
#define repi(i,a,b) for(int i=int(a);i<(b);i++)
#define all(x) x.begin(),x.end()

const ll mod = 1e9+7;
const ll INF = 1e9;

ll gcd(ll a,ll b){return b?gcd(b,a%b):a;}
int dx[4]={1,0,-1,0};
int dy[4]={0,1,0,-1};

bool valid(int lx,int ux,int ly,int uy,int x,int y){
	return (lx<=x&&x<ux&&ly<=y&&y<uy);
}

void dfs(vector<vector<int>> &s,int w,int h,int x,int y){
	s[y][x]=0;
	repi(dx,-1,2){
		repi(dy,-1,2){
			if(valid(0,w,0,h,x+dx,y+dy)&&s[y+dy][x+dx]==1){
				dfs(s,w,h,x+dx,y+dy);
			}
		}
	}
}

int main()
{
	int w,h;
	while(cin>>w>>h,w!=0&&h!=0){
		vector<vector<int>> s(h,vector<int>(w,0));
		rep(y,h)rep(x,w)cin>>s[y][x];

		int ans=0;
		rep(y,h){
			rep(x,w){
				if(s[y][x]==1)ans++,dfs(s,w,h,x,y);
			}
		}
		cout<<ans<<endl;
	}
	return 0;
}

C++: #include<iostream>
#include<vector>
#include<map>
#include<string>
#include<cstring>
#include<bitset>
#include<stack>
#include<queue>
#include<cmath>
#include<algorithm>
#include<cstdio>
#include<numeric>
using namespace std;

const int dx[4]={1,0,-1,0};
const int dy[4]={0,1,0,-1};

#define rep(i,x) for(int i=0;i<x;i++)
#define re(i,x,y) for(int i=x;i<y;i++)

long long INF=1e9;
const long long mod=2019;
#define ll long long

int H,W;
vector<vector<int>>field;
void dfs(int h,int w){
  field[h][w]=0;
  for(int dh=-1;dh<=1;dh++){
    for(int dw=-1;dw<=1;dw++){
      int nh=h+dh,nw=w+dw;
      if(nh<0||nh>=H||nw<0||nw>=W)continue;
      if(field[nh][nw]==0)continue;
      dfs(nh,nw);
    }
  }
}

int main(){
  while(cin>>W>>H){
    if(H==0||W==0)break;
    field.assign(H,vector<int>(W,0));
    for(int h=0;h<H;h++){
      for(int w=0;w<W;w++){
        cin>>field[h][w];
      }
    }
    int count=0;
    for(int h=0;h<H;h++){
      for(int w=0;w<W;w++){
        if(field[h][w]==0)continue;
        dfs(h,w);
        count++;
      }
    }
    cout<<count<<endl;
  }
}

C++: #include <cstdio>
#define f(n)for(int i=0;i<n;i++)
#define s(w)scanf("%d",&w)
int a,n,m,d[99][99];
int u[16]={-1,-1,-1,0,0,1,1,1,-1,0,1,-1,1,-1,0,1};
void k(int x,int y){
	if(d[x][y]){f(8)k(x+u[i],y+u[i+8]);d[x][y]=0;}
}
int main(){
	a=0;
	s(n);s(m);
	f(9801)d[i/99][i%99]=0;
	f(n*m)s(d[i/n+1][i%n+1]);
	f(n*m)if(d[i/n+1][i%n+1])a++,k(i/n+1,i%n+1);
	printf("%d\n",a);
	main();
}

C++: #include <bits/stdc++.h>
#define rep(i,n) for(int i = 0; i < n; i++)

using namespace std;

    int w,h;
    int c[55][55];
    vector<vector<bool> > seen;
    int mx[8] = {-1,1,0,-1,1,-1,0,1};
    int my[8] = {0,0,1,1,1,-1,-1,-1};
    
    void dfs(int x,int y){
    	::seen[x][y] = true;
    	
    	for(int i = 0; i < 8; i++){
			int nx = x + mx[i];
			int ny = y + my[i];
			
			if(nx < 0 || nx >= h || ny < 0 || ny >= w)	continue;
			if(::seen[nx][ny])	continue;
			if(c[nx][ny] == 0)	continue;
			
			dfs(nx,ny);
		}
    }
int main(){
	while(true){
	cin >> w >> h;
	if(w == 0 && h == 0) break;
	::seen.assign(55,vector<bool>(55,false)); //initilaization
	
	
	int count = 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++){
			if(::seen[i][j])	continue;
			if(c[i][j] == 0)	continue;
			
			dfs(i,j);
			count++;
		}
	}
	cout << count << endl;
	}
}