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 int;
using ullong = unsigned long long;
#define rep(i,n) for(int i = 0; i < n; i++)
#define FOR(i, a, b)  for(int i = (a); i < (b) ; i++)
#define pb push_back
#define SORT(v,n) sort(v, v+n)
#define ALL(x) (x).begin(),(x).end()
#define debug(x) cerr << #x << ": " << x << '\n'
#define elif else if
//#define llint

#ifdef llint
#define int ll
static const int INF = numeric_limits<long long>::max();
#else
static const int INF = numeric_limits<int>::max();
#endif // llint
static const int MOD = (int)1e9 + 7;
const double EPS = 1e-9;
int dx[8] = { 1, 0, -1, 0, 1, -1, -1, 1 };
int dy[8] = { 0, 1, 0, -1, 1, 1, -1, -1 };

int w, h;

void dfs(int x,int y,vector<vector<int>>& map) {
	map[y][x] = 0;
	//rep(y, h) {
	//	rep(x, w) {
	//		cout << map[y][x] << " ";
	//	}
	//	cout << endl;
	//}
	//cout << endl;
	//cout << "x : " << x << " y : " << y << endl;
	rep(i, 8) {
		int tx = x + dx[i];
		int ty = y + dy[i];
		//cout << "nx : " << tx << " ny : " << ty << endl;
		if (tx >= 0 and tx < map[0].size() and ty >= 0 and ty < map.size()) {
			if(map[ty][tx] == 1)
				dfs(tx, ty, map);
		}
	}
	return;
}

signed main() {
	ios::sync_with_stdio(true);
	while (true) {
		cin >> w >> h;
		if (w == 0 and h == 0) break;
		vector<vector<int>>  map(h);
		rep(i, h) {
			rep(j, w) {
				int x;
				cin >> x;
				map[i].pb(x);
			}
		}
		int ans = 0;
		rep(y,h){
			rep(x, w) {
				if (map[y][x] == 1) {
					dfs(x, y, map);
					ans++;
				}
			}
		}
		cout << ans << endl;
	}
	return 0;
}

C++: #include<bits/stdc++.h>
using namespace std;
#define rep(i, n) for(int i = 0; i < (int)(n); i++)
using ll = long long;
using pint = pair<int,int>;

int w, h;
int field[55][55];

void dfs(int sh, int sw){
    for(int dx = -1; dx <= 1; dx++){
        for(int dy = -1; dy <= 1; dy++){
            int nh = sh + dx, nw = sw + dy;
            if(nh < 0 || h <= nh || nw < 0 || w <= nw) continue;
            if(field[nh][nw] == 0) continue;
            field[nh][nw] = 0;
            dfs(nh, nw);
        }
    }
}

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

    cout << cnt << endl;
}

int main(){
    while(cin >> w >> h){
        if(h == 0 || w == 0) break;
        rep(i,h)rep(j,w) cin >> field[i][j];
        solve();
    }
}

C++: #include <iostream>
#include <vector>
#include <string>
#include <cmath>
#include <algorithm>

using namespace std;

int c[52][52];

void er(int i,int j){
    c[i][j]--;
    if(c[i+1][j-1])
        er(i+1,j-1);
    if(c[i][j+1])
        er(i,j+1);
    if(c[i+1][j])
        er(i+1,j);
    if(c[i+1][j+1])
        er(i+1,j+1);
    if(c[i-1][j+1])
        er(i-1,j+1);
    if(c[i-1][j])
        er(i-1,j);
    if(c[i-1][j-1])
        er(i-1,j-1);
    if(c[i][j-1])
        er(i,j-1);
}

int main(void){
    int w,h;
    int i,j;
    int a;
    while(true){
        cin >> w >> h;
        if(w == 0){
            break;
        }
        for(i = 0;i < 52;i++){
            for(j = 0;j < 52;j++){
                c[i][j] = 0;
            }
        }
        for(i = 1;i <= h;i++){
            for(j = 1;j <= w;j++){
                cin >> c[i][j];
            }
        }
        a = 0;
        for(i = 1;i <= h;i++){
            for(j = 1;j <= w;j++){
                if(c[i][j]){
                    er(i,j);
                    a++;
                }
            }
        }
        cout << a << endl;
    }
}

C++: #include <iostream>
#include <queue>
#include <stack>
#include <vector>
#include <stdio.h>
#include <algorithm>
#include <string>
#include <cstring>
#include <cmath>
#include <complex>
#include <map>
#include <climits>
using namespace std;

#define reep(i,a,b) for(int i=(a);i<(b);++i)
#define rep(i,n) reep((i),0,(n))
#define ALL(v) (v).begin(),(v).end()
#define PB push_back
#define EPS 1e-8
#define F first
#define S second
#define mkp make_pair

static const double PI=6*asin(0.5);
typedef long long ll;
typedef complex<double> CP;
typedef pair<int,int> pii;
typedef pair<ll,ll> pll;
typedef vector<int> vint;
static const int INF=1<<24;


int main(){
	int n,m;
	while(cin>>m>>n,n||m){
		int a[n][m];
		rep(i,n){
			rep(j,m){
				cin>>a[i][j];
				//cout<<a[i][j]<<" ";
			}
			//cout<<endl;
			
		}
		//cout<<endl;
		int ans=0;
		rep(i,n){
			rep(j,m){
				if(a[i][j]==1){
					a[i][j]=0;
					ans++;
					queue<pii> q;
					q.push(mkp(i,j));
					while(!q.empty()){
						int qs= q.size();
						rep(k,qs){
							pii tp=q.front();
							q.pop();
							int v[8][2]={0,1,0,-1,1,0,-1,0,1,1,1,-1,-1,1,-1,-1};
							rep(l,8){
								int x=tp.F+v[l][0],y=tp.S+v[l][1];
								if(x>=0&&y>=0&&x<n&&y<m){
									if(a[x][y]==1){
										q.push(mkp(x,y));
										a[x][y]=0;
									}
								}
							}
						}
					}/*
					
					rep(k,n){
						rep(l,m){
							cout<<a[k][l]<<" ";
						}
						cout<<endl;
					}
					cout<<endl;
					*/
				}
			}
		}
		cout<<ans<<endl;
	}
	return 0;
}