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 <iostream>
#include <vector>

using namespace std;

int w, h;
int cnt;
vector<vector<int>> vvi;

void dfs(int x, int y) {
    vvi[y][x] = 0;
    for (int j = -1; j <= 1; j++) {
        for (int i = -1; i <= 1; i++) {
            if (x+i < 0 || w <= x+i || y+j < 0 || h <= y+j)
                continue;
            if (vvi[y+j][x+i]) {
                dfs(x+i, y+j);
            }
        }
    }
}

int main()
{
    while (cin >> w >> h, w|h) {
        // input
        vvi.clear();
        cnt = 0;
        for (int j = 0; j < h; j++) {
            vector<int> vi;
            for (int i = 0; i < w; i++) {
                int c;
                cin >> c;
                vi.push_back(c);
            }
            vvi.push_back(vi);
        }

        // dfs
        for (int y = 0; y < h; y++) {
            for (int x = 0; x < w; x++) {
                if (vvi[y][x]) {
                    dfs(x, y);
                    cnt++;
                }
            }
        }

        // output
        cout << cnt << endl;
    }
    return 0;
}

C++: // http://judge.u-aizu.ac.jp/onlinejudge/description.jsp?id=1160&lang=jp
// ????????¶????????£???????????????????????????????????°???????????£?????????
#include <bits/stdc++.h>
using namespace std;
typedef pair<int, int> P;
int w, h, cnt;
int c[50][50], m[50][50];
int dx[8] = {-1, 0, 1, -1, 1, -1, 0, 1};
int dy[8] = {-1, -1, -1, 0, 0, 1, 1, 1};
int main() {
    while(scanf("%d%d",&w,&h)) {
        if (w==0&&h==0) break;
        memset(m, -1, sizeof(m)); cnt = 0;
        for (int i=0; i<h; i++) for (int j=0; j<w; j++) scanf("%d",&c[i][j]);
        for (int i=0; i<h; i++) for (int j=0; j<w; j++) {
            if (m[i][j] == -1 && c[i][j] == 1) {
                cnt++;
                queue<P> q;
                q.push(P(i,j));
                while(!q.empty()) {
                    P p = q.front(); q.pop();
                    m[p.first][p.second] = 0;
                    for (int k=0; k<8; k++) {
                        int ny = p.first + dy[k];
                        int nx = p.second + dx[k];
                        if (nx >= 0 && nx < w && ny >= 0 && ny < h && m[ny][nx] == -1 && c[ny][nx] == 1) {
                            q.push(P(ny,nx));
                        }
                    }
                }
            }
        }
        printf("%d\n",cnt);
    }
}

C++: #include<iostream>

using namespace std;

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

void rec(int x,int y){
  grid[y][x]=false;
  for(int i=-1;i<2;i++){
    for(int j=-1;j<2;j++){
      int ny=y+i,nx=x+j;
      if(0<=nx && nx<w && 0<=ny && ny<h && grid[ny][nx])
	rec(nx,ny);
    }
  }
}

int main(void){

  while(cin >> w >> h,w|h){
    for(int i=0;i<h;i++)
      for(int j=0;j<w;j++)cin >> grid[i][j];
    
    int ans=0;
    for(int i=0;i<h;i++)
      for(int j=0;j<w;j++)
	if(grid[i][j])rec(j,i),ans++;
  
    cout << ans << endl;
  }
  return 0;
}

C++: #include<iostream>

using namespace std;

int h, w, map[51][51];

const int vx[] = {1,0,-1,0}, vy[] = {0,1,0,-1};

void island(int _w, int _h) {
	map[_w][_h] = 2;
	for (int i = 0;i < 4;i++) {
		if (_w + vy[i] >= 1 && _w + vy[i] <= w&&_h + vx[i] >= 1 && _h + vx[i] <= h&&map[_w+vy[i]][_h+vx[i]] == 1) {
			island(_w + vy[i], _h + vx[i]);
		}
	}
}

int main() {
	while (cin >> w >> h, w + h) {
		for (int i = 1;i <= h;i++) {
			for (int j = 1;j <= w;j++) {
				cin >> map[i][j];
			}
		}
		int count = 0;
		for (int i = 1;i <= w;i++) {
			for (int j = 1;j <= h;j++) {
				if (map[i][j] == 1) {
					count++, island(i, j);
				}
			}
		}
		cout << count << endl;
		for (int i = 1;i <= w;i++)for (int j = 1;j <= h;j++)map[i][j] = -1;
	}
	return 0;
}

C++: 
#include <cstdio>
#include <iostream>
#include <algorithm>
#include <cstdlib>
#include <cmath>
#include <vector>
#include <ctime>
#include <string>
#include <map>
#include <stack>
#include <queue>

using namespace std;

int w, h;
const int MAX = 50;
int c[MAX][MAX];


void check(int x, int y){
	c[x][y] = 0;
    for(int dx = -1; dx <= 1; dx++){
        for(int dy = -1; dy <= 1; dy++){
            if(x + dx >= 0 && x + dx <= h  && y + dy >= 0 && y + dy <= w && c[x + dx][y + dy] == 1){
            	check(i + dx, j + dy);
            } 
        }
    }
	
}

int main(void){

	for(int i = 0; i < MAX ; i++){
		for(int j = 0; j < MAX; j++){
			c[i][j] = 0;
		}
	}


	while(cin >> w != 0 && cin >> h != 0){
		int ans = 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(c[i][j] == 1){
					check(i, j);
					ans++;
				}
			}
		}
		cout << ans << endl;
	}
	
    return 0;
}