Go: package main

import (
	"bufio"
	"fmt"
	"io"
	"os"
	"strconv"
)

const (
	initialBufSize = 100000
	maxBufSize     = 1000000
)

var sc *bufio.Scanner

func initScanner(r io.Reader) *bufio.Scanner {
	buf := make([]byte, initialBufSize)

	sc := bufio.NewScanner(r)
	sc.Buffer(buf, maxBufSize)
	sc.Split(bufio.ScanWords) // bufio.ScanLines
	return sc
}

func main() {
	sc = initScanner(os.Stdin)
	resolve()
}

func resolve() {
	results := []int{}
	for true {
		w, h := scanInt(sc), scanInt(sc)
		if w == 0 && h == 0 {
			break
		}
		grid := make([][]int, h)
		for i := 0; i < h; i++ {
			grid[i] = make([]int, w)
			for j := 0; j < w; j++ {
				grid[i][j] = scanInt(sc)
			}
		}
		num := 0
		for i := range loop0(h) {
			for j := range loop0(w) {
				start := pos{y: i, x: j}
				if grid[start.y][start.x] == 0 {
					continue
				}
				num++
				_dfs(grid, w, h, start)
			}
		}
		results = append(results, num)
	}
	for _, v := range results {
		fmt.Println(v)
	}
	return
}

func _dfs(grid [][]int, w, h int, start pos) {
	grid[start.y][start.x] = 0
	for _, df := range []pos{
		pos{1, 0}, pos{-1, 0},
		pos{0, -1}, pos{0, 1},
		pos{1, 1}, pos{-1, -1},
		pos{-1, 1}, pos{1, -1},
	} {
		np := addPos(start, df)
		if np.y < 0 || h <= np.y || np.x < 0 || w <= np.x {
			continue
		}
		if grid[np.y][np.x] == 0 {
			continue
		}
		_dfs(grid, w, h, np)
	}
}

type pos struct{ x, y int }

func addPos(p, d pos) pos {
	return pos{
		x: p.x + d.x,
		y: p.y + d.y,
	}
}

func loop0(n int) chan int {
	return loop(0, n-1, 1)
}

func loop1(n int) chan int {
	return loop(1, n, 1)
}

func loop(s, e, d int) chan int {
	ch := make(chan int)
	go func() {
		for i := s; i <= e; i += d {
			ch <- i
		}
		close(ch)
	}()
	return ch
}

// snip-scan-funcs
func scanInt(sc *bufio.Scanner) int {
	sc.Scan()
	i, _ := strconv.Atoi(sc.Text())
	return int(i)
}
func scanString(sc *bufio.Scanner) string {
	sc.Scan()
	return sc.Text()
}

C++: #include <iostream>
#include <algorithm>
#include <vector>
#include <queue>
#include <set>
#include <cmath>
#include <string>
#define FI first
#define SE second
#define PF push_front
#define PB push_back
#define PPF pop_front
#define PPB pop_back
#define MA make_pair
#define ll long long
#define PA pair<int,int>
#define VE vector<int>
#define VP vector<PA>
#define FOR(i,a,b) for(int i=a;i<b;i++)
#define ROF(i,a,b) for(int i=b-1;i>=a;i--)
#define YES(i) cout<<(i?"YES":"NO")<<endl
#define Yes(i) cout<<(i?"Yes":"No")<<endl
using namespace std;
//
const int INF=1e9+7;
const int mod=1e9+7;
//
struct poi{
	int X;int Y;int Z;
	bool operator<(const poi&R)const{
		return X==R.X ? Y==R.Y ? Z<R.Z : Y<R.Y : X<R.X;
	}
};
/*
ll GCD(ll A,ll B){
  return (B==0)?(A):(GCD(B,A%B));
}
ll LCM(ll A,ll B){
  return A/GCD(A,B)*B;
}
*/
int W,H;
int C[50][50];
void DFS(int x,int y){
	C[x][y]=0;
	FOR(i,-1,2){
		FOR(j,-1,2){
			if(0<=x+i&&x+i<H&&0<=y+j&&y+j<W&&C[x+i][y+j]==1){
				DFS(x+i,y+j);
			}
		}
	}
}
int main(){
	while(1){
		cin>>W>>H;
		if(W==0&&H==0){
			break;
		}
		//
		FOR(i,0,H){
			FOR(j,0,W){
				cin>>C[i][j];
			}
		}
		int ans=0;
		FOR(i,0,H){
			FOR(j,0,W){
				if(C[i][j]==1){
					DFS(i,j);
					ans++;
				}
			}
		}
		cout<<ans<<endl;
	}
	return 0;
}

C++: #include <iostream>
#include <cstring>
using namespace std;
#define REP(i,n) for(int i=0; i<(int)(n); i++)

int w,h;
int island[50][50];
int visited[50][50];
const int dx[] = {0,-1,-1,-1,0,1,1,1};
const int dy[] = {-1,-1,0,1,1,1,0,-1};

void umeru(int x, int y){
	
	visited[y][x] = 1;
	//printf("%d,%d\n",x,y);
	REP(k,8){
		int tx = x + dx[k];
		int ty = y + dy[k];
		if( tx<0 || ty<0 || tx>=w || ty>=h )continue;
		if( island[ty][tx]==0 || visited[ty][tx]==1 )continue;
		umeru(tx,ty);
	}
	return;
}
int main(){
	while(cin>>w>>h,w|h){
		int ans = 0;
		memset(visited,0,sizeof(visited));
		REP(i,h)REP(j,w)cin>>island[i][j];
		REP(i,h)REP(j,w)if( island[i][j] && !visited[i][j] ){
			umeru(j,i);
			ans++;
		}
		cout << ans << endl;
	}
	return 0;
}