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 <cstdio>
#include <queue>
#include <cstring>

using namespace std;

typedef pair<int, int> p;

int t_x[] = {1, 1, 1, 0, -1, -1, -1, 0};
int t_y[] = {1, 0, -1, -1, -1, 0, 1, 1};

int field[52][52];  

int main()
{
  while (true) {
    memset(field, 0, sizeof field);
    int width, height;
    scanf("%d %d", &width, &height);
    
    if (width == 0 && height == 0) break;
    
    for (int i = 1; i <= height; i++) {
      for (int j = 1; j <= width; j++) {
	scanf(" %d", &field[i][j]);
      }
    }
    
    queue<p> que;
    int c = 0;

    for (int i = 1; i <= height; i++) {
      for (int j = 1; j <= width; j++) {
	if (field[i][j] == 1) {
	  c++;
	  que.push(p(i, j));
	  field[i][j] = 0;
	  while (!que.empty()) {
	    p tmp = que.front();
	    que.pop();
	    //field[tmp.second][tmp.first] = 0;
	    //cout << tmp.first << ", " << tmp.second << endl;
	    for (int k = 0; k < 8; k++) {
	      int tx = tmp.second + t_x[k];
	      int ty = tmp.first + t_y[k];
	      //cout << ty << ", "<< tx << " =  "<< field[ty][tx] << endl;
	      if (field[ty][tx] == 1) {
		field[ty][tx] = 0;
		que.push(p(ty, tx));
	      }
	    }
	    //cout << endl;
	    //cout << i << " " << j << endl;
	    for (int k = 1; k <= height; k++) {
	      for (int l = 1; l <= width; l++) {
		//cout << field[k][l] << " ";
	      }
	      //cout << endl;
	    }
	    //cout << endl;
	  }
	}
      }     
    }
    cout << c << endl;
  }
  return 0;
}

C++: #include <bits/stdc++.h>
#include <math.h>
using namespace std;
int W,H;
char field[60][60];
int dx[8]{-1,0,1,-1,1,-1,0,1};
int dy[8]{1,1,1,0,0,-1,-1,-1};

void dfs(int x,int y){
    field[x][y] = '0';
    for(int i = 0;i < 8;i++){
        int nx = x + dy[i];
        int ny = y + dx[i];
        if(0 <= nx && nx < H && 0 <= ny && ny < W && field[nx][ny] == '1'){
            dfs(nx,ny);
        }
    }
    return;
}
int main(){
    for(int k = 0;1;k++){
    cin >> W >> H;
    if(H == 0 && W == 0){
        return 0;
    }
    for(int i = 0;i < H;i++){
        for(int j = 0;j < W;j++){
            cin >> field[i][j];
        }
    }
    int ans = 0;
    bool frag = 0;
    for(int i = 0;i < H;i++){
        for(int j = 0;j < W;j++){
            if(field[i][j] == '1'){
                ans++;
                dfs(i,j);
            }
        }
    }
    cout << ans  << endl;
    }
}

C++: #include "bits/stdc++.h"
using namespace std;
typedef long long ll;
// #define int long long

template <class T>
bool INRANGE(T x, T a, T b) { return a <= x && x <= b; }
template <class T>
inline bool chmin(T &a, T b)
{
    if (a > b)
    {
        a = b;
        return true;
    }
    return false;
}
template <class T>
inline bool chmax(T &a, T b)
{
    if (a < b)
    {
        a = b;
        return true;
    }
    return false;
}

#define REP(i, n) for (int i = 0; i < (n); ++i)
#define RREP(i, n) for (int i = (n); i >= 0; --i)
#define FOR(i, a, b) for (int i = (a); i < (b); ++i)
#define RFOR(i, a, b) for (int i = (a); i >= (b); --i)
#define ALL(v) (v).begin(), (v).end()
#define RALL(a) (a).rbegin(), (a).rend()
#define debug(x) cerr << #x << " = " << (x) << " (L" << __LINE__ << ")" \
                      << " " << __FILE__ << endl;

typedef vector<int> vi;
typedef vector<string> vs;
typedef vector<vi> vvi;
typedef pair<int, int> pii;

int dh[] = {-1, -1, -1, 0, 0, 1, 1, 1};
int dw[] = {-1, 0, 1, -1, 1, -1, 0, 1};

vvi m;
int cnt;
vector<vector<bool>> visited;

void next(int h, int w) {
    if (m[h][w] == 0) return;
    if (visited[h][w]) return;
    visited[h][w] = true;

    REP(i, 8) {
        int nh = h + dh[i];
        int nw = w + dw[i];
        if (!INRANGE(nh, 0, (int)m.size()-1)) continue;
        if (!INRANGE(nw, 0, (int)m[0].size()-1)) continue;
        next(nh, nw);
    }
}

void dfs(int h, int w) {
    if (m[h][w] == 0) return;
    if (visited[h][w]) return;
    visited[h][w] = true;

    cnt++;
    REP(i, 8) {
        int nh = h + dh[i];
        int nw = w + dw[i];
        if (!INRANGE(nh, 0, (int)m.size()-1)) continue;
        if (!INRANGE(nw, 0, (int)m[0].size()-1)) continue;
        next(nh, nw);
    }
}

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

    while (true)
    {
        int w, h;
        cin >> w >> h;
        if (w == 0 and h == 0) break;

        m = vvi();
        REP(_, h) {
            vi l(w);
            //cin >> l;
            REP(i, w) cin >> l[i];
            m.emplace_back(l);
        }

        visited = vector<vector<bool>>(h, vector<bool>(w, false));
        cnt = 0;
        REP(hi, h) {
            REP(wi, w) {
                dfs(hi, wi);
            }
        }

        cout << cnt << endl;
    }
    
    


    return 0;
}