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 <cmath>
#include <algorithm>
#define rep(i, n) for(int i = 0; i < (int)(n); i++)
#define REP(i,k,n) for(int i = k; i < (int)(n); i++)
using namespace std;

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

void dfs(int y, int x){
        field[y][x]= 0;

        int dx[] = {-1,-1,-1,0,0,1,1,1};
        int dy[] = {-1,0,1,-1,1,-1,0,1,};
        rep(i,8){
                int nx = x+dx[i];
                int ny = y+dy[i];
                if(nx>=0 && nx<w && ny>=0 && ny<h && field[ny][nx] == 1) dfs(ny,nx);
        }
        return;
}

int main(){
        while(true) {
                cin >> w >> h;
                if(w==0) break;
                rep(y,h) rep(x,w){
                        cin >> field[y][x];
                }
                int ans = 0;
                rep(y,h) rep(x,w){
                        if(field[y][x] == 1) {
                                dfs(y,x);
                                ans++;
                        }
                }
                cout << ans << endl;
        }

        return 0;
}

C++: #include <iostream>
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <algorithm>
#include <string>
#include <sstream>
#include <complex>
#include <vector>
#include <list>
#include <queue>
#include <deque>
#include <stack>
#include <map>
#include <set>
#include <iomanip>
using namespace std;
typedef long long ll;
template<typename T> using min_priority_queue = priority_queue<T, vector<T>, greater<T>>;

#define EPS (1e-7)
#define INF (1e15)
#define PI (acos(-1))
#define MOD 1000000007

#define REP(i,n) for(int i=0;i<n;i++)
#define REPS(i,f,n) for(int i=(f);i<(n);i++)
#define EACH(it,v) for(__typeof((v).begin()) it=(v).begin();it!=(v).end();it++)

#define dump(x)  cout << #x << " = " << (x) << endl;
#define debug(x) cout << #x << " = " << (x) << " (L" << __LINE__ << ")" << " " << __FILE__ << endl;
#define arrdump(n,a) for(int i=0;i<n;i++) {cout<<((i>0)? " ":"")<<a[i];}cout<<"\n";


typedef pair<int, int> P;
typedef pair<ll, ll> LP;
typedef pair<int, P> PP;
typedef pair<ll, LP> LPP;

int dy4[]={0, 0, 1, -1};
int dx4[]={1, -1, 0, 0};
int dx8[]={0, 0, 1, -1, 1, 1, -1, -1};
int dy8[]={1, -1, 0, 0, 1, -1, -1, 1};

// http://judge.u-aizu.ac.jp/onlinejudge/description.jsp?id=1160&lang=jp

int C[99][99];
int w, h;

static void dfs(int i , int j) {
    C[i][j] = 0;

    REP(k, 8) {
        int nx = j + dx8[k];
        int ny = i + dy8[k];
        if (nx >= 0 && nx < w && ny >= 0 && ny < h) {
            if (C[ny][nx] == 1) {
                dfs(ny, nx);
            }
        }
    }          
}

int main() {

    while (true) {
        cin >> w >> h;
        if (w==0&&h==0) break;

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

        int cnt = 0;
        while(true) {
            bool found = false;
            for (int i = 0; i < h; i++) {
                for (int j = 0; j < w; j++) {
                    if (C[i][j] == 1) {
                        dfs(i, j);
                        cnt++;
                    }
                }
            }

            if (!found) break;
        }

        cout << cnt << "\n";
    }

    return 0;
}

C++: #include <iostream>
#include <algorithm>
#include <cstdlib>
#include <cstring>
#include <cstdio>
#include <vector>
#include <queue>
using namespace std;
int H,W;
bool fld[50][50];
void del(int x,int y){
	fld[x][y]=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 && nx<W && ny>=0 && ny<H && fld[nx][ny])del(nx,ny);
		}
	}
}
int main(){
	while(cin>>W>>H,W,H){
		for(int i=0;i<H;i++){
			for(int j=0;j<W;j++){
				cin>>fld[j][i];
			}
		}
		int cnt=0;
		for(int i=0;i<H;i++){
			for(int j=0;j<W;j++){
				if(fld[j][i]){
					cnt++;
					fld[j][i]=0;
					del(j,i);
				}
			}
		}
		cout<<cnt<<endl;
	}
}

C++: #include<bits/stdc++.h>

using namespace std;
using ll = long long;
using ld = long double;
#define rep(i,n) for(int i=0;i<(int)(n);i++)
#define reps(i,s,n) for(int i=(int)(s);i<(int)(n);i++)
	int w, h;
	int c[50][50] = {};

	void dfs(int i, int j) {
		c[i][j] = 0;

		for (int di = -1; di <= 1;di++) {
			for (int dj = -1; dj <= 1;dj++) {
				int ni = i + di;
				int nj = j + dj;

				if (0 <= ni&&ni < h && 0 <= nj&&nj < w && c[ni][nj] == 1) {
					dfs(ni, nj); 
				}
			}
		}
		return;
}

int main() {
	cin.sync_with_stdio(false);
	vector<int>ans;
	while (1) {
		cin >> w >> h;
		rep(i, h) {
			rep(j, w) {
				cin >> c[i][j];
			}
		}
		int res = 0;
		rep(i, h) {
			rep(j, w) {
				if (c[i][j] == 1) {
					dfs(i, j);
					res++;
				}
			}
		}
		if (w == 0&&h == 0) {
			break;
		}
		ans.push_back(res);


	}
	rep(i, ans.size()) {
		cout << ans[i] << endl;
	}

	return 0;
}