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 <algorithm>
#include <string>
#include <vector>
#include <tuple>
#include <queue>

using namespace std;

class Solver {
public:
	static void solve() {
		int w, h;
		cin >> w >> h;
		vector<int> res;
		while (w > 0 && h > 0) {
			vector<vector<bool>> grid(h, vector<bool>(w));
			for (int i = 0; i < h; i++) {
				for (int j = 0; j < w; j++) {
					int now;
					cin >> now;
					grid[i][j] = now;
				}
			}

			int cnt = 0;
			vector<vector<int>> visited(h, vector<int>(w, false));

			for (int i = 0; i < h; i++) {
				for (int j = 0; j < w; j++) {
					if (!grid[i][j] || visited[i][j])continue;

					cnt++;

					queue<tuple<int, int>> que;
					que.push(make_tuple(i, j));
					while (!que.empty()) {
						auto pos = que.front();
						que.pop();
						int y = get<0>(pos);
						int x = get<1>(pos);
						if (y < 0 || h <= y || x < 0 || w <= x
							|| !grid[y][x] || visited[y][x])continue;

						visited[y][x] = true;

						que.push(make_tuple(y - 1, x));
						que.push(make_tuple(y + 1, x));
						que.push(make_tuple(y, x - 1));
						que.push(make_tuple(y, x + 1));
						que.push(make_tuple(y - 1, x - 1));
						que.push(make_tuple(y + 1, x - 1));
						que.push(make_tuple(y - 1, x + 1));
						que.push(make_tuple(y + 1, x + 1));
					}
				}
			}

			res.emplace_back(cnt);

			cin >> w >> h;
		}

		for (int i = 0; i < res.size(); i++) {
			cout << res[i] << endl;
		}
	}
};

int main() {
	Solver::solve();
}

C++: #define _CRT_SECURE_NO_WARNINGS

#include <iostream>
#include <string>
#include <vector>
#include <cmath>
#include <fstream>
#include <set>
#include <utility>
#include <algorithm>
#include <queue>
#include <stack>
#include <deque>
#include <numeric>
#include <sstream>
#include <list>
#include <map>
#include <functional>
#include <iterator>

#define rep(i,p,n) for(int i=(int)p;i<(int)n;i++)
#define repp(i,p,n) for(int i=(int)p;i>=(int)n;i--)
#define Sort(x) sort(x.begin(),x.end())
#define PSort(x) sort(begin(x), end(x), pairCompare)
#define ll long long
#define INF 2000000000
#define pb push_back
#define mp make_pair
#define PI 3.14159265358979
int dx[4] = { -1,0,1,0 }, dy[4] = { 0,1,0,-1 };
using namespace std;

vector<vector<int>> v;
int w, h;

void dfs(int y, int x) {
	if (v[y][x] == 1)v[y][x] = 0;

	for (int i = -1; i <= 1; i++) {
		for (int j = -1; j <= 1; j++) {
			int nx = x + i, ny = y + j;

			if (!(nx < 0 || ny < 0 || nx >= w||ny >= h)&&v[ny][nx] == 1) dfs(ny, nx);
		}
	}
	
	return;
}

int main(){
	while (1) {
		int ans=0;
		cin >> w >> h;
		if (w == 0 && h == 0)break;
		v.resize(h, vector<int>(w));
		rep(i, 0, h) {
			rep(j, 0, w) {
				cin >> v[i][j];
			}
		}

		rep(i, 0, h) {
			rep(j, 0, w) {
				if (v[i][j] == 1) {
					ans++;
					dfs(i, j);
				}
			}
		}
		cout << ans << endl;
		v.clear();
	}
	
	return 0;
}

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

int w, h;
int field[50][50];
const int dx[8] = {0, 0, 1, -1, -1, -1, 1, 1};
const int dy[8] = {1, -1, 0, 0, -1, 1, -1, 1};

void dfs(const int x, const int y, const int label) {
	field[y][x] = label;
	for(int i = 0; i < 8; ++i) {
		const int nx = x + dx[i], ny = y + dy[i];
		if(nx < 0 || ny < 0 || nx >= w || ny >= h)
			continue;

		if(field[ny][nx] == 1)
			dfs(nx, ny, label);
	}
}

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

	while(cin >> w >> h, w) {
		for(int i = 0; i < h; ++i)
			for(int j = 0; j < w; ++j)
				cin >> field[i][j];

		int label = 2;
		for(int i = 0; i < h; ++i)
			for(int j = 0; j < w; ++j)
				if(field[i][j] == 1)
					dfs(j, i, label++);

		cout << label - 2 << endl;
	}

	return EXIT_SUCCESS;
}

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

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

void dfs(int v[][55], int x, int y){
    v[y][x] = 0;
    for(int i=0;i<8;++i)
        if(v[y+dy[i]][x+dx[i]] == 1)
            dfs(v, x+dx[i], y+dy[i]);
}

int main(){
    int w, h;
    while(cin >> w >> h, w != 0){
        int v[55][55]={0};
        for(int i=0;i<h;++i)
            for(int j=0;j<w;++j)
                cin >> v[i][j];
        int ans = 0;
        for(int i=0;i<h;++i)
            for(int j=0;j<w;++j)
                if(v[i][j] == 1){
                    ans++;
                    dfs(v, j, i);
                }
        cout << ans << endl;
    }

    return 0;
}