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 int long long   // <-----!!!!!!!!!!!!!!!!!!!

#define rep(i,n) for (int i=0;i<(n);i++)
#define rep2(i,a,b) for (int i=(a);i<(b);i++)
#define rrep(i,n) for (int i=(n)-1;i>=0;i--)
#define rrep2(i,a,b) for (int i=(b)-1;i>=(a);i--)
#define all(a) (a).begin(),(a).end()

typedef long long ll;
typedef pair<int, int> P;
typedef tuple<int, int, int> TUPLE;
typedef vector<int> V;
typedef vector<V> VV;
typedef vector<VV> VVV;

const int INF = 1e9;
int dx[8] = {1, 0, -1, 0, 1, 1, -1, -1};
int dy[8] = {0, 1, 0, -1, 1, -1, 1, -1};

int H, W;
int s[50][50];
int d[50][50];

bool inside(int x, int y) {
    return 0 <= x && x < H && 0 <= y && y < W;
}

int bfs(int sx = -1, int sy = -1, int gx = -1, int gy = -1) {
    queue<P> que;
    que.push(P(sx, sy));

    while (!que.empty()) {
        P p = que.front(); que.pop();
        if (p.first == gx && p.second == gy)
             break;

        rep(k, 8) {
            int nx = p.first + dx[k], ny = p.second + dy[k];

            if (inside(nx, ny) && s[nx][ny] != 0 && d[nx][ny] == INF) {
                que.push(P(nx, ny));
                d[nx][ny] = d[p.first][p.second] + 1;
            }
        }
    }
    return d[gx][gy];
}

signed main() {
    std::ios::sync_with_stdio(false);
    std::cin.tie(0);

    while (cin >> W >> H, W) {
        rep(i, H) {
            rep(j, W) {
                cin >> s[i][j];
                d[i][j] = INF;
            }
        }

        int ans = 0;
        rep(i, H) {
            rep(j, W) {
                if (d[i][j] == INF && s[i][j] == 1) {
                    bfs(i, j);
                    ans++;
                }
            }
        }
        cout << ans << endl;
    }
}

C++: #include<bits/stdc++.h>
using namespace std;
#define rep(i,n) for(int i=0;i<n;++i)
int m[55][55];
int qx[1000000],qy[1000000];
int s,e,x,y,ans;

void push(int bx,int by){
  e++;
  qx[e]=bx;
  qy[e]=by;
}
void pop(){
  x=qx[s];
  y=qy[s];
  s++;
}
void bfs(int bx,int by){
  s=0; e=-1;
  push(bx,by);
  m[by][bx]=0;
  while(s<=e){
    pop();
    for(int i=y-1;i<y+2;++i){
      for(int j=x-1;j<x+2;++j){
	if(m[i][j]){
	  push(j,i);
	  m[i][j]=0;
	}
      }
    }
  }
}
int main(){
  int w,h;
  while(cin>>w>>h,w){
    //init
    rep(i,55) rep(j,55) m[i][j]=0;
    ans=0;
    
    rep(i,h){
      rep(j,w){
	int a; cin>>a;
	m[i][j]=a;
      }
    }
    rep(i,h) rep(j,w)
      if(m[i][j]){
	bfs(j,i);
	ans++;
      }    
    cout<<ans<<endl;
  }
  return 0;
}

C++: #include <bits/stdc++.h>
#include<algorithm>
#define int long long
using namespace std;
#define rep(i, n) for (int i = 0; i < (int)(n); i++)
#define INF 1000000000000
int MOD=1000000007;
int w,h;
int tansaku[51][51];
int c[51][51];
int a[3]={1,-1,0};
void dfs(int x,int y){
  if(tansaku[x][y]||x<0||x>=h||y<0||y>=w||c[x][y]==0){return;}
  tansaku[x][y]=1;
  rep(i,3){
    rep(j,3){
          dfs(x+a[i],y+a[j]);
      }
    }
  }
signed main() {

while(true){
  cin>>w>>h;
  int ans=0;
if(w==0&&h==0){break;}
rep(i,51){
  rep(j,51){
    tansaku[i][j]=0;
  }
}
rep(i,h){rep(j,w)cin>>c[i][j];}
rep(j,h){
  rep(i,w){
    if((!tansaku[j][i])&&(c[j][i]==1)){dfs(j,i);ans++;}
  }
}
cout<<ans<<endl;
}
}