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;
typedef long long ll;
#define rep(i, n) for(int(i) = 0; i < (int)(n); (i)++)
using Graph = vector<vector<int>>;

int w, h;
ll cnt = 0;
Graph G;
struct Direct {
    int x;
    int y;
};

Direct direction[8] = {{-1, -1}, {0, -1}, {1, -1}, {-1, 0},
                       {1, 0},   {-1, 1}, {0, 1},  {1, 1}};

void dfs(int x, int y) {
    if(G[y][x] == 1) {
        G[y][x] = 0;
    }
    rep(i, 8) {
        if(0 <= x + direction[i].x && x + direction[i].x < w) {
            if(0 <= y + direction[i].y && y + direction[i].y < h) {
                if(G[y + direction[i].y][x + direction[i].x] == 1) {
                    dfs(x + direction[i].x, y + direction[i].y);
                }
            }
        }
    }
}

int main() {
    while(1) {
        cnt=0;
        cin >> w >> h;

        G = Graph(h);
        if(!w && !h) break;
        rep(i, h) {
            G[i] = vector<int>(w);
        }
        rep(i, h) {
            rep(j, w) {
                cin >> G[i][j];
            }
        }
        rep(i, h) {
            rep(j, w) {
                if(G[i][j]) {
                    cnt++;
                    dfs(j, i);
                }
            }
        }
        cout << cnt << endl;
    }
    return 0;
}

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

typedef struct{
	int first;
	int second;
}point;

int main(){
	while(1){
		int w, h;
		int field[50][50];
		int dx[8]={1,1,0,-1,-1,-1,0,1}, dy[8]={0,1,1,1,0,-1,-1,-1};
		
		scanf(" %d %d", &w, &h);
		if(w==0) break;
		
		for(int i=0; i<h; ++i)
		for(int j=0; j<w; ++j)	
		scanf(" %d", &field[i][j]);
		
		int ans=0;
		for(int i=0; i<h; ++i){
			for(int j=0; j<w; ++j){
			
				if(field[i][j]==1){
					//printf("%d %d\n", i, j);
					queue<point> que;
					point p;
					p.first=i; p.second=j;
					field[i][j]=2; //訪問済み
					que.push(p);
					++ans;
					
					//bfs
					while(!que.empty()){
						p=que.front();
						que.pop();
						for(int k=0; k<8; ++k){
							int nf=p.first+dy[k], ns=p.second+dx[k];
							if(nf>=0 && nf<h && ns>=0 && ns<w && field[nf][ns]==1){
								field[nf][ns]=2;
								point q;
								q.first=nf;
								q.second=ns;
								que.push(q);
							}	
						}
					
					}
		
				}
			}
			
		}
		printf("%d\n", ans);
	}
	return 0;
}

C++: #include<iostream>

using namespace std;

bool map[50][50];
int h,w;
int dx[]={-1,0,1},dy[]={-1,0,1};
void solve(void);
void loop(int ,int );
void draw(void);
int main(){
	while(cin>>h>>w,h){
		for(int i=0;i<w;i++){
			for(int j=0;j<h;j++){
				cin>>map[i][j];
			}
		}
		solve();
	}
	return 0;
}
void solve(void){
	int cnt=0;
	for(int i=0;i<w;i++){
		for(int j=0;j<h;j++){
			if(map[i][j]){
				loop(i,j);	
				cnt++;	
			}
		}
	}
	cout<<cnt<<endl;
}
void loop(int x,int y){
	map[x][y]=0;
	for(int i=0;i<3;i++){
		for(int j=0;j<3;j++){
			
			if(map[x+dx[i]][y+dy[j]]){
				loop(x+dx[i],y+dy[j]);
			}
		}
	}
	return ;
}

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

void dfs(vector<vector<int> > &map, int x, int y){
    map[x][y] = 0;
    for(int dx = -1; dx <= 1; dx++){
        for(int dy = -1; dy <= 1; dy++){
            int nx = x + dx, ny = y + dy;
            if(1 <= nx && nx <= map.size()-2 && 1 <= ny && ny <= map[dx].size()-2 && map[nx][ny] == 1) dfs(map, nx, ny);
        }
    }
}

int main(){
    while(1){
        int W, H;
        cin >> W >> H;
        if(W == 0) break;
    
        vector<vector<int> > map(H+2, vector<int>(W+2));
        for(int i = 1; i <= H; i++){
            for(int j = 1; j <= W; j++){
                cin >> map[i][j];
            }
        }
    
        int res = 0;
        for(int i = 1; i <= H; i++){
            for(int j = 1; j <= W; j++){
                if(map[i][j] == 1){
                    dfs(map, i, j);
                    res++;
                }
            }
        }
    
        cout << res << endl;
    }
    return 0;
}