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;
// define
#define endl "\n"
#ifdef LOCAL
#define lout cerr
#else
ostream devnull(0);
#define lout devnull
#endif
#define AMULET \
  cin.tie(0);  \
  ios::sync_with_stdio(false);
// https://github.com/kurokoji/.cpp-Template/blob/master/template/template2.cpp
#define GET_MACRO(_1, _2, _3, _4, NAME, ...) NAME
#define rep(...) GET_MACRO(__VA_ARGS__, rep4, rep3, rep2, rep1) \
(__VA_ARGS__)
#define rep1(n) rep2(_, n)
#define rep2(i, n) rep3(i, 0, n)
#define rep3(i, a, n) rep4(i, a, n, 1)
#define rep4(i, a, n, d) rep5(i, a, n, d, <)
#define rep5(i, a, n, d, o) for (auto i = decltype(n)(a), _n = (n); i o _n; i += (d))

#define rrep(...) GET_MACRO(__VA_ARGS__, rrep4, rrep3, rrep2, rrep1) \
(__VA_ARGS__)
#define rrep1(a) rrep2(_, a)
#define rrep2(i, a) rrep3(i, a, 0)
#define rrep3(i, a, n) rrep4(i, a, n, -1)
#define rrep4(i, a, n, d) rep5(i, (a)-1, n, d, >=)

#define dump(x) lout << #x << " = " << x << endl;
// alias
typedef long long ll;
typedef long long lint;
typedef pair<int, int> pii;
typedef pair<lint, lint> pll;
// func
template <class C>
inline void vcin(C &c);
template <class C, class D>
inline void vcin(C &c, D &d);
template <class C>
inline void vcout(const C &c, const string separate = "\n");
template <class T = int>
inline T in();

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

void dfs(int x, int y);

void solve()
{
  while (true)
  {
    cin >> w >> h;

    if (w == 0 && h == 0)
      break;

    rep(j, h) rep(i, w)
    {
      cin >> c[i][j];
    }

    int cnt = 0;
    rep(j, h) rep(i, w) if (c[i][j] == 1)
    {
      dfs(i, j);
      cnt++;
    }

    cout << cnt << endl;
  }
}

void dfs(int x, int y)
{
  c[x][y] = 0;
  rep(dy, -1, 2) rep(dx, -1, 2)
  {
    int nx = x + dx;
    int ny = y + dy;
    if (nx >= 0 && ny >= 0 && nx < w && ny < h && c[nx][ny] == 1)
    {
      dfs(nx, ny);
    }
  }
}

signed main()
{
  AMULET
  solve();
  return 0;
}

template <class C>
inline void vcin(C &c)
{
  for (auto &a : c)
  {
    cin >> a;
  }
}
template <class C, class D>
inline void vcin(C &c, D &d)
{
  for (auto it1 = c.begin(), it2 = d.begin(); it1 != c.end() && it2 != d.end(); it1++, it2++)
  {
    cin >> *it1 >> *it2;
  }
}
template <class C>
inline void vcout(const C &c, const string separate)
{
  for (auto it = c.begin(); it != c.end(); it++)
  {
    if (it != c.begin())
      cout << separate;
    cout << *it;
  }
}
template <class T = int>
inline T in()
{
  T x;
  cin >> x;
  return (x);
}

C++: #include<bits/stdc++.h>
#define rep(i,n) for(int i = 0;i<n;i++)
using namespace std;
typedef pair<int,int> P;
typedef long long ll;
template<class T> inline bool chmax(T& a, T b) { if (a < b) { a = b; return 1; } return 0;}
template<class T> inline bool chmin(T& a, T b) { if (a > b) { a = b; return 1; } return 0;}

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

void dfs(int x,int y) {
    for(int dx = -1;dx<=1;dx++) {
        for(int dy = -1;dy<=1;dy++) {
            int nx = x + dx;
            int ny = y + dy;
            if(nx<0 || nx>=h || ny<0 || ny>=w) continue;
            if(c[nx][ny] == 0) continue;
            if(c[nx][ny] == 1) c[nx][ny] = 0;
            dfs(nx,ny);
        }
    }
}

int main() {
    while(true) {
        cin >> w >> h;
        if(w == 0 && h == 0) break;
        rep(i,h) rep(j,w) {
            cin >> c[i][j];
        }
        int ans = 0;
        rep(i,h) rep(j,w) {
            if(c[i][j] == 1) {
                ans++;
                dfs(i,j);
            }
        }
        cout << ans << endl;
    }    
}

C++: #include <iostream>
#include <string>
#include <algorithm>
#include <vector>
using namespace std;

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

short map[50][50];
int w, h;

void dfs(int x, int y) {
    map[x][y] = 0;
    int d[3] = {-1,0,1};
    rep(i, 9) {
        int xx = x+d[i%3];
        int yy = y+d[i/3];
        if( 0<=xx && xx<w && 0<=yy && yy<h && map[xx][yy]==1 ) {
            dfs( xx, yy );
        }
    }
}

int main(){
    while( cin >> w >> h, w||h ) {
        int lands = 0;
        rep(y,h) rep(x,w) cin >> map[x][y];
        rep(y, h) {
            rep(x, w) {
                if( map[x][y] == 1 ) {
                    lands++;
                    dfs(x, y);
                }
            }
        }
        cout << lands << endl;
    }
    return 0;
}

C++: #include <iostream>
#include <vector>
using namespace std;

int w,h;
vector<vector<int> > m;
int dx[] = {0, 0,1,-1,1, 1,-1,-1};
int dy[] = {1,-1,0, 0,1,-1, 1,-1};

void dfs(int y, int x){
  m[y][x] = 0;
  
  for(int i=0; i<8; i++){
    int nx = x + dx[i];    
    int ny = y + dy[i];
    if(nx >= w || nx < 0 || ny >= h || ny < 0) continue;
    if(m[ny][nx] == 1)
      dfs(ny,nx);
  }

}



int main(){

  while(1){
    cin >> w >> h;
    if(!w and !h) break;

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

    int ans = 0;
    for(int i=0; i<h; i++){
      for(int j=0; j<w; j++){
	if(m[i][j] == 1){
	  dfs(i,j);
	  ans++;
	}
      }
    }
    cout << ans << endl;
  }

}