Go: package main

import (
	"bufio"
	"fmt"
	"io"
	"os"
	"strconv"
)

const (
	initialBufSize = 100000
	maxBufSize     = 1000000
)

var sc *bufio.Scanner

func initScanner(r io.Reader) *bufio.Scanner {
	buf := make([]byte, initialBufSize)

	sc := bufio.NewScanner(r)
	sc.Buffer(buf, maxBufSize)
	sc.Split(bufio.ScanWords) // bufio.ScanLines
	return sc
}

func main() {
	sc = initScanner(os.Stdin)
	resolve()
}

func resolve() {
	results := []int{}
	for true {
		w, h := scanInt(sc), scanInt(sc)
		if w == 0 && h == 0 {
			break
		}
		grid := make([][]int, h)
		for i := 0; i < h; i++ {
			grid[i] = make([]int, w)
			for j := 0; j < w; j++ {
				grid[i][j] = scanInt(sc)
			}
		}
		num := 0
		for i := range loop0(h) {
			for j := range loop0(w) {
				start := pos{y: i, x: j}
				if grid[start.y][start.x] == 0 {
					continue
				}
				num++
				_dfs(grid, w, h, start)
			}
		}
		results = append(results, num)
	}
	for _, v := range results {
		fmt.Println(v)
	}
	return
}

func _dfs(grid [][]int, w, h int, start pos) {
	grid[start.y][start.x] = 0
	for _, df := range []pos{
		pos{1, 0}, pos{-1, 0},
		pos{0, -1}, pos{0, 1},
		pos{1, 1}, pos{-1, -1},
		pos{-1, 1}, pos{1, -1},
	} {
		np := addPos(start, df)
		if np.y < 0 || h <= np.y || np.x < 0 || w <= np.x {
			continue
		}
		if grid[np.y][np.x] == 0 {
			continue
		}
		_dfs(grid, w, h, np)
	}
}

type pos struct{ x, y int }

func addPos(p, d pos) pos {
	return pos{
		x: p.x + d.x,
		y: p.y + d.y,
	}
}

func loop0(n int) chan int {
	return loop(0, n-1, 1)
}

func loop1(n int) chan int {
	return loop(1, n, 1)
}

func loop(s, e, d int) chan int {
	ch := make(chan int)
	go func() {
		for i := s; i <= e; i += d {
			ch <- i
		}
		close(ch)
	}()
	return ch
}

// snip-scan-funcs
func scanInt(sc *bufio.Scanner) int {
	sc.Scan()
	i, _ := strconv.Atoi(sc.Text())
	return int(i)
}
func scanString(sc *bufio.Scanner) string {
	sc.Scan()
	return sc.Text()
}

C++: #include <iostream>
#include <cstdio>
#include <string>
#include <vector>
#include <algorithm>
#include <cmath>
#include <set>
#include <map>
#include <unordered_map>
#include <unordered_set>
#include <stack>
#include <queue>
//ranker
using namespace std;

#define REPS(i, a, n) for (int i = (a); i < (n); ++i)
#define REP(i, n) REPS(i, 0, n)
#define RREP(i, n) REPS(i, 1, n + 1)
#define DEPS(i, a, n) for (int i = (a); i >= n; --i)
#define DEP(i, n) DEPS(i, n, 0)

using ll = long long;
using ull = unsigned long long;
using vi = vector<int>;
using vvi = vector<vi>;
using vvvi = vector<vvi>;
using pii = pair<int, int>;
using pis = pair<int, string>;
using psi = pair<string, int>;
using D = double;

void merge (int *first1, int *last1, int *first2, int *last2){
    int size1 = last1 - first1;
    int size2 = last2 - first2;
    int *result = new int[size1+size2];
    int i = 0;
    int j = 0;
    int index = 0;
    while (true){
        if (i < size1 && (first1[i] <= first2[j] || j >= size2)){
            result[index] = first1[i];
            ++i; ++index;
        }
        if (j < size2 && (first1[i] > first2[j] || i >= size1)){
            result[index] = first2[j];
            ++j; ++index;
        }
        if (i==size1 && j==size2){
            for (i=0; i<size1; ++i) first1[i] = result[i];
            for (j=0; j<size2; ++j) first2[j] = result[j+size1];
            delete[] result;
            return;
        }
    }
}
void MergeSort (int *first, int *last){
    int size = last - first;
    if(size <= 1) return;
    MergeSort(first, first+size/2);
    MergeSort(first+size/2, last);
    merge(first, first+size/2, first+size/2, last);
}


int gcd(int a, int b)
{
    int c;

    if (a < b) {
        a+=b; b=a-b; a-=b;
    }

    while (b != 0) {
        c = a % b;
        a = b;
        b = c;
    }

    return a;
}

int dx[3]={-1, 0, 1};
int dy[3]={-1, 0, 1};
int W, H;
int  masu[100][100]={0};
int cnt;

//????????????????¨???°?????????
//abs(dx[i]+dy[j])==1??§??????

int dfs(int a, int b){
  masu[a][b] = 2;
  REP(i, 3)REP(j, 3) if(masu[a+dx[i]][b+dy[j]]== 1 && a+dx[i] >= 0 && a+dx[i] < W && b+dx[j] >= 0 && b+dx[j] < H){
    dfs(a+dx[i], b+dy[j]);
  }
  return 1;
}


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

  while(1){
    cin >> W >> H;
    if(W == 0 && H == 0) break;
    REP(j, H)REP(i, W) cin >> masu[i][j];

    cnt = 0;
    REP(j, H) REP(i, W) if(masu[i][j]==1){
      cnt+=dfs(i, j);
    }
    cout << cnt << endl;
  }
    return 0;
}

C++: #include <iostream>
#include <cstdio>
#include <string>
#include <vector>
#include <algorithm>
#include <cmath>
#include <set>
#include <map>
#include <unordered_map>
#include <unordered_set>
#include <stack>
#include <queue>
//ranker
using namespace std;

#define REPS(i, a, n) for (int i = (a); i < (n); ++i)
#define REP(i, n) REPS(i, 0, n)
#define RREP(i, n) REPS(i, 1, n + 1)
#define DEPS(i, a, n) for (int i = (a); i >= n; --i)
#define DEP(i, n) DEPS(i, n, 0)

using ll = long long;
using ull = unsigned long long;
using vi = vector<int>;
using vvi = vector<vi>;
using vvvi = vector<vvi>;
using pii = pair<int, int>;
using pis = pair<int, string>;
using psi = pair<string, int>;
using D = double;

void merge (int *first1, int *last1, int *first2, int *last2){
    int size1 = last1 - first1;
    int size2 = last2 - first2;
    int *result = new int[size1+size2];
    int i = 0;
    int j = 0;
    int index = 0;
    while (true){
        if (i < size1 && (first1[i] <= first2[j] || j >= size2)){
            result[index] = first1[i];
            ++i; ++index;
        }
        if (j < size2 && (first1[i] > first2[j] || i >= size1)){
            result[index] = first2[j];
            ++j; ++index;
        }
        if (i==size1 && j==size2){
            for (i=0; i<size1; ++i) first1[i] = result[i];
            for (j=0; j<size2; ++j) first2[j] = result[j+size1];
            delete[] result;
            return;
        }
    }
}
void MergeSort (int *first, int *last){
    int size = last - first;
    if(size <= 1) return;
    MergeSort(first, first+size/2);
    MergeSort(first+size/2, last);
    merge(first, first+size/2, first+size/2, last);
}


int gcd(int a, int b)
{
    int c;

    if (a < b) {
        a+=b; b=a-b; a-=b;
    }

    while (b != 0) {
        c = a % b;
        a = b;
        b = c;
    }

    return a;
}

int dx[3]={-1, 0, 1};
int dy[3]={-1, 0, 1};
int W, H;
int  masu[10000][10000];
int cnt;

//????????????????¨???°?????????
//abs(dx[i]+dy[j])==1??§??????

int dfs(int a, int b){
  masu[a][b] = 2;
  REP(i, 3)REP(j, 3) if(masu[a+dx[i]][b+dy[j]]== 1 && a+dx[i] >= 0 && a+dx[i] < W && b+dx[j] >= 0 && b+dx[j] < H){
    dfs(a+dx[i], b+dy[j]);
  }
  return 1;
}


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

  while(1){
    cin >> W >> H;
    if(W == 0 && H == 0) break;
    REP(j, H)REP(i, W) cin >> masu[i][j];

    cnt = 0;
    REP(j, H) REP(i, W) if(masu[i][j]==1) cnt+=dfs(i, j);
    cout << cnt << endl;
  }
    return 0;
}