Go: package main

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

func getScanner(fp *os.File) *bufio.Scanner {
	scanner := bufio.NewScanner(fp)
	scanner.Split(bufio.ScanWords)
	scanner.Buffer(make([]byte, 1000005), 1000005)
	return scanner
}

func getNextString(scanner *bufio.Scanner) string {
	scanner.Scan()
	return scanner.Text()
}

func getNextInt(scanner *bufio.Scanner) int {
	i, _ := strconv.Atoi(getNextString(scanner))
	return i
}

func getNextInt64(scanner *bufio.Scanner) int64 {
	i, _ := strconv.ParseInt(getNextString(scanner), 10, 64)
	return i
}

func getNextUint64(scanner *bufio.Scanner) uint64 {
	i, _ := strconv.ParseUint(getNextString(scanner), 10, 64)
	return i
}

func getNextFloat64(scanner *bufio.Scanner) float64 {
	i, _ := strconv.ParseFloat(getNextString(scanner), 64)
	return i
}

func main() {
	fp := os.Stdin
	wfp := os.Stdout
	cnt := 0

	if os.Getenv("MASPY") == "ますピ" {
		fp, _ = os.Open(os.Getenv("BEET_THE_HARMONY_OF_PERFECT"))
		cnt = 0
	}
	if os.Getenv("MASPYPY") == "ますピッピ" {
		wfp, _ = os.Create(os.Getenv("NGTKANA_IS_GENIUS10"))
	}

	scanner := getScanner(fp)
	writer := bufio.NewWriter(wfp)
	for solve(scanner, writer) {

	}
	for i := 0; i < cnt; i++ {
		fmt.Fprintln(writer, "-----------------------------------")
		solve(scanner, writer)
	}
	writer.Flush()
}

func solve(scanner *bufio.Scanner, writer *bufio.Writer) bool {
	sol := solver{}
	sol.w = getNextInt(scanner)
	sol.h = getNextInt(scanner)
	if sol.w == 0 && sol.h == 0 {
		return false
	}
	sol.land = makeInts(sol.h, sol.w)
	for y := 0; y < sol.h; y++ {
		for x := 0; x < sol.w; x++ {
			sol.land[y][x] = getNextInt(scanner)
		}
	}
	ans := 0
	for y := 0; y < sol.h; y++ {
		for x := 0; x < sol.w; x++ {
			if sol.land[y][x] == 0 {
				continue
			}
			ans++
			sol.dfs(y, x)
		}
	}
	fmt.Fprintln(writer, ans)
	return true
}

type solver struct {
	w, h int
	land [][]int
}

func (sol *solver) dfs(y, x int) {
	if y < 0 {
		return
	}
	if y >= sol.h {
		return
	}
	if x < 0 {
		return
	}
	if x >= sol.w {
		return
	}
	if sol.land[y][x] == 0 {
		return
	}
	sol.land[y][x] = 0
	dy := [8]int{-1, -1, -1, 0, 0, 1, 1, 1}
	dx := [8]int{-1, 0, 1, -1, 1, -1, 0, 1}
	for i := 0; i < 8; i++ {
		sol.dfs(y+dy[i], x+dx[i])
	}
}
func makeInts(h, w int) [][]int {
	index := make([][]int, h, h)
	data := make([]int, h*w, h*w)
	for i := 0; i < h; i++ {
		index[i] = data[i*w : (i+1)*w]
	}
	return index
}

C++: #include <bits/stdc++.h>
#include <algorithm>
#include <stdlib.h>
using namespace std;
int W, H; 
char C[60][60] = {}; 
void search(int x, int y){
	C[x][y] = '0'; 
	for(int dx = -1; dx <= 1; dx++){
		for(int dy = -1; dy <= 1; dy++){
			int nx = x + dx; int ny = y + dy; 
			if(nx >= 0 && nx < H && ny >= 0 && ny < W && C[nx][ny] == '1') search(nx, ny); 
		}
	}
	return; 
}
int main() {
	for(int K; ; K++){
	cin >> W >> H; 
	if(W == 0){break;}
	for(int i = 0; i < H; i++){
		for(int j = 0; j < W; j++){
			cin >> C[i][j]; 
		}
	}
	int count = 0; 
	for(int i = 0; i < H; i++){
		for(int j = 0; j < W; j++){
			if(C[i][j] == '1'){search(i, j); count ++; }
		}
	}
	for(int i = 0; i < H; i++){
		for(int j = 0; j < W; j++){
			C[i][j] = '0'; 
		}
	}
	cout << count << endl; 
	}
}

C++: 
#include "bits/stdc++.h"
//#include <iostream>
//#include <vector>
//#include <string>
using namespace std;
#define repi(i,a,b) for(int i=(a), i##_len=(b); i<i##_len; ++i)
#define rep(i,n) repi(i,0,n)
#define repi_(i,a,b) for(int i=(a), i##_len=(b); i<=i##_len; ++i)
#define rep_(i,n) repi_(i,0,n)
#define all(x) (x).begin(),(x).end()
#define vsort(v) sort((v).begin(), (v).end())
#define gsort(v) tsort(v); reverse((v).begin(), (v).end())
#define vrev(v) reverse((v).begin(), (v).end())
#define siz(v) ((int)(v).size())
#define ers(v, n) (v).erase((v).begin() + n)
#define cnt(v, n) count(all(v), n)
#define vmin(v) *min_element(v.begin(), v.end())
#define vmax(v) *max_element(v.begin(), v.end())
#define el "\n"
#define co(x) cout<<(x)<<el
#define coc(c, a, b) if(c)co((a));else co((b))
#define cosp(x) cout<<(x)<<' '
#define YES(c) coc(c,"YES", "NO")
#define Yes(c) coc(c,"Yes", "No")
#define yes(c) coc(c,"yes", "no")
#define POSSIBLE(c) coc(c, "POSSIBLE", "IMPOSSIBLE")
#define Possible(c) coc(c, "Possible", "Impossible")
#define possible(c) coc(c, "possible", "impossible")
#define inf INT_MAX
#ifdef tqktmp_2
#define gc() getchar(); getchar()
#else
#define gc() 1
#endif
const unsigned int bf0 = (1 << 0);
const unsigned int bf1 = (1 << 1);
const unsigned int bf2 = (1 << 2);
const unsigned int bf3 = (1 << 3);
const unsigned int bf4 = (1 << 4);
const unsigned int bf5 = (1 << 5);
const unsigned int bf6 = (1 << 6);
const unsigned int bf7 = (1 << 7);

typedef long long lint;
typedef vector<int> ivec; typedef vector<string> svec;

const int
	dx8[8] = { 0,1,1,1,0,-1,-1,-1 },
	dy8[8] = { 1,1,0,-1,-1,-1,0,1 },
	dx4[4] = { 0,1,0,-1 },
	dy4[4] = { 1,0,-1,0 };

template<class T>inline bool maxi(T &a, const T &b) { if (a<b) { a = b; return 1; } return 0; }
template<class T>inline bool mini(T &a, const T &b) { if (b<a) { a = b; return 1; } return 0; }




lint w, h;
vector<ivec> m;
lint p, q;

int dfs(int x, int y) {//x, yからつながっている陸(1)をすべて2にし、1を返す
	if (m[x][y] != 1)return 0;
	m[x][y] = 2;
	rep(i, 8) {
		p = x + dx8[i], q = y + dy8[i];
		if (0 <= p && p < w && 0 <= q && q < h)dfs(p, q);
	}
	return 1;
}

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

	ivec in;
	lint ctr;
	while (cin >> h >> w) {
		if (h == 0 && w == 0)return 0;
		in.resize(h);
		rep(i, w) {
			rep(j, h) {
				cin >> in[j];
			}
			m.push_back(in);
		}
		ctr = 0;
		rep(i, w)rep(j, h) {
			ctr += dfs(i, j);
		}
		co(ctr);
		m.clear();
		vector<ivec>().swap(m);
	}
	gc();
}

C++: #include <iostream>
#include <cmath>
#include <vector>

using namespace std;

#define loop(i,a,b) for(int i=(a);i<int(b);i++)
#define rep(i,b) loop(i,0,b)

int c[200][200];
int vis[200][200];
int w,h;


void dfs(int ci, int cj){
    vis[ci][cj] = true;
    int di[] = {0,1,0,-1, 1,1,-1,-1};
    int dj[] = {1,0,-1,0, -1,1,-1,1};
    rep(d,8){
        int ni = ci+di[d];
        int nj = cj+dj[d];
        if(ni < 0 || nj < 0) continue;
        if(ni >= h || nj >= w) continue;
        if(vis[ni][nj]) continue;
        if(c[ni][nj]==0) continue;
        dfs(ni,nj);
    }
}

int main(){
    while(cin >> w >> h && w){
        rep(i,h)rep(j,w) cin >> c[i][j], vis[i][j] = 0;
        int ans = 0;
        rep(i,h)rep(j,w){
            if(vis[i][j]) continue;
            if(c[i][j] == 0) continue;
            dfs(i,j);
            ans++;
        }
        cout << ans << endl;
    }
}

C++: #include <iostream>
#include <algorithm>

using namespace std;

int c[50][50];

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

int ret;

int w,h;

void dfs(int x,int y){
	if(c[x][y] == 0) return;
	c[x][y] = 0;
	for(int i=0;i<8;i++){
		if(x+dx[i] < 0 || x+dx[i] >= w) continue;
		if(y+dy[i] < 0 || y+dy[i] >= h) continue;
		dfs(x+dx[i],y+dy[i]);
	}
}

int main(){
	while(cin >> w >> h,w){
		ret = 0;
		for(int i=0;i<h;i++){
			for(int j=0;j<w;j++){
				cin >> c[j][i];
			}
		}
		for(int i=0;i<h;i++){
			for(int j=0;j<w;j++){
				if(c[j][i] == 1){
					ret++;
					dfs(j,i);
				}
			}
		}
		cout << ret << endl;
	}
	return 0;
}