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>
#include<algorithm>
#include<string>
#include<queue>
#include<utility>
int dx[4] = {0,1,0,-1};
int dy[4] = {1,0,-1,0};
int gx[8] = {1,1,0,-1,-1,-1,0,1};
int gy[8] = {0,1,1,1,0,-1,-1,-1};
#define REP(i,n) for(int i=0;i<(n);i++)

using namespace std;

int nextInt(){int a;cin>>a;return a;}

int main(){
  int w,h,ct;
  
  queue<pair<int,int>> que;
  while(cin>>h>>w){
    if(!h&&!w)break;
    vector<vector<int>> d(w,vector<int>(h,-1));
    REP(i,w){
      REP(j,h){
	d[i][j] = nextInt();
      }
    }
    ct = 0;
    REP(i,w){
      REP(j,h){
	int def_i = i;
	int def_j = j;
	if(d[def_i][def_j] !=1)continue;
	else ct++;
	  que.push(make_pair(def_i,def_j));
	  while(que.size()){
	    pair<int,int> p = que.front();
	    que.pop();
	    REP(k,8){
	      def_i = gy[k] + p.first;def_j = gx[k] + p.second;
	      if(def_i>=0 && def_i<w && def_j>=0 && def_j<h){
		if(d[def_i][def_j] !=1)continue;
		else {
		  d[def_i][def_j] = -1;
		  que.push(make_pair(def_i,def_j));
		}
	      }
	    }
	  }
      }
    }
    cout << ct << endl;
    
  }
	
	return 0;
}

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

const int MAX = 50;
int dx[8] = { 1,0,-1,0,1,1,-1,-1 };
int dy[8] = { 0,1,0,-1,1,-1,1,-1 };
int map[MAX][MAX];
int color[MAX][MAX];

void dfs(int x, int y, int c)
{
	color[x][y] = c;

	for (int i = 0; i < 8; i++) {
		int nx = x + dx[i];
		int ny = y + dy[i];

		if (nx >= 0 && nx < MAX&&ny >= 0 && ny < MAX) {
			if (map[nx][ny] == 1) {
				if (color[nx][ny] == 0) {
					dfs(nx, ny, c);
				}
			}
		}
	}
}

int main()
{
	while (true) {
		int w, h;
		cin >> w >> h;

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

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

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

		int ans = 0;

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

		cout << ans << endl;
	}

	return 0;
}

C++: #include <bits/stdc++.h>
using namespace std;

int w,h;
int f[51][51];
int d[3] = {0,-1,1};

void dfs(int x, int y) {
    int i,j,nx,ny;
    f[x][y] = 0;
    for(i=0; i<3; i++)
        for(j=0; j<3; j++) {
            if(i+j == 0)
                continue;
            nx=x+d[i], ny=y+d[j];
            if(nx<0 || nx>=h || ny<0 || ny>=w)
                continue;
            if(f[nx][ny] == 1)
                dfs(nx,ny);
        }
}

int main() {
    int i,j,r;
    while(1) {
        r=0;
        cin >> w >> h;
        if(w+h == 0)
            break;

        for(i=0; i<h; i++)
            for(j=0; j<w; j++)
                cin >> f[i][j];
        
        for(i=0; i<h; i++)
            for(j=0; j<w; j++)
                if(f[i][j] == 1) {
                    dfs(i, j);
                    r++;
                }
        cout << r << endl;
    }
}

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

int a[52][52];
int w, h;
int yy[8] = {-1, 0, 0, 1, -1, -1, 1, 1};
int xx[8] = {0, 1, -1, 0, -1, 1, -1, 1};
int solve(int y, int x){
	if(a[y][x] == 0)return 0;
	a[y][x] = 0;
	int ans = 0;
	for(int i = 0;i < 8;i++){
		ans += solve(y+yy[i], x+xx[i]);
	}
	return 1;
}

int main(){
	int y, x;
	while(cin >> w >> h, w){
		int ans = 0;
		fill((int*)a, (int*)(a+52), 0);
		for(int i = 1;i <= h;i++)
		for(int j = 1;j <= w;j++)cin >> a[i][j];
		for(int i = 1;i <= h;i++){
			for(int j = 1;j <= w;j++){
				if(a[i][j])ans += solve(i, j);
			}
		}
		cout << ans << endl;
	}
	return 0;
}

C++: #define	_USE_MATH_DEFINES
#include <iostream>
#include <algorithm>
#include <functional>
#include <vector>
#include <cstdio>
#include <string>
#include <cmath>
#include <cfloat>
#include <map>
#include <queue>
#include <stack>
#include <list>
using namespace std;
int x,y;
int o[52][52];
queue<int> q;
void tansaku(int j,int i){
	if(j<1||j>x||i<1||i>y||o[i][j]==0||o[i][j]==2){
		return ;
	}
	if(o[i][j]==1){
		if(q.empty())
		q.push(1);
		o[i][j]=2;
	}
	
	tansaku(j+1,i);
	tansaku(j-1,i);
	tansaku(j,i+1);
	tansaku(j,i-1);
	tansaku(j+1,i+1);
	tansaku(j-1,i-1);
	tansaku(j+1,i-1);
	tansaku(j-1,i+1);
}
int main(){

	while(cin>>x>>y,x!=0||y!=0){
		int count=0;
		for(int i=1;i<=y;i++){
			for(int j=1;j<=x;j++){
				cin>>o[i][j];
			}
		}
		for(int i=1;i<=y;i++){
			for(int j=1;j<=x;j++){
				tansaku(j,i);
				if(!q.empty()){
				count+=q.front();
				}
				q.pop();
			}
		}
		
		cout<<count<<endl;
	}

}