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<iostream>
#include<queue>
using namespace std;

struct mapst {
	int x, y;
};

int main() {
	int w, h, ans=0;
	int c[52][52]={{0}}, f[52][52]={{1}};
	int dx[8] = {-1, -1, 0, 1, 1, 1, 0, -1};
	int dy[8] = {0, -1, -1, -1, 0, 1, 1, 1};
	queue<mapst> q;
	while(1) {
		cin >> w >> h;
		if(!w&&!h) break;
		ans = 0;
		for(int i=0; i<52; ++i) for(int j=0; j<52; ++j) {
			c[i][j] = 0;
			f[i][j] = 1;
		}
		for(int i=1; i<=h; ++i) for(int j=1; j<=w; ++j) {
			cin >> c[i][j];
			f[i][j] = 1-c[i][j];
		}
		for(int i=1; i<=h; ++i) for(int j=1; j<=w; ++j) {
			if(c[i][j]&&!f[i][j]) {
				mapst m, ms;
				m.x = j; m.y = i;
				q.push(m);
				ans++;
				while(!q.empty()) {
					m = q.front();
					q.pop();
					f[m.y][m.x] = 1;
					for(int k=0; k<8; k++) {
						int nx = m.x + dx[k], ny = m.y + dy[k];
						if(c[ny][nx]&&!f[ny][nx]) {
							ms.x = nx; ms.y = ny;
							q.push(ms);
						}
					}
				};
			}
		}
		cout << ans << endl;
	}
	return 0;
}

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

const int limit=55;
int grid[limit][limit];
int w, h;
int dx[] = {-1, 0, 1, 0, -1, -1, 1, 1}, dy[] = {0, -1, 0, 1, -1, 1, -1, 1};

void dfs(int, int);

int main(){
  while(cin >> w >> h, w!=0 && h!=0){
    //グリッドに情報格納
    for(int i=0; i<h; i++){
      for(int j=0; j<w; j++) cin >> grid[i][j];
    }

    int cnt=0;
    for(int i=0; i<h; i++){
      for(int j=0; j<w; j++){
        if(grid[i][j]==1){
          dfs(i, j);
          cnt++;
        }
      }
    }
    cout << cnt << endl;
  }

  return 0;
}

void dfs(int y, int x){
  if(grid[y][x]==0) return;
  if(y<0 || y>=h || x<0 || x>=w) return;

  grid[y][x] = 0;

  for(int i=0; i<8; i++){
    int ny = y+dy[i], nx = x+dx[i];
    dfs(ny, nx);
  }
}

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

using namespace std;

#define rep(i, n) for (int i = 0; i < int(n); i++)
#define vec vector

int dp[55][55];

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)
{
	if (!dp[x][y]) return;
	dp[x][y] = 0;
	rep(i, 8) dfs(x + dx[i], y + dy[i]);
}

int main(void)
{
	while(1) {
		int w, h;
		cin >> w >> h;
		if (!w) break;
		rep(i, h + 2) rep(j, w + 2) dp[i][j] = 0;
		rep(i, h) rep(j, w) {
			cin >> dp[i + 1][j + 1];
		}
		
		int ret = 0;
		rep(i, h) rep(j, w) {
			if (!dp[i + 1][j + 1]) continue;
			ret++;
			dfs(i + 1, j + 1);
		}
		cout << ret << endl;
	}
	return 0;

}

C++: #include <bits/stdc++.h>
#define rep(i, n) for (int i = 0; i < (n); ++i)
using namespace std;
// using ll = long long;
// using P = pair<int, int>;

int m[51][51];
bool check[51][51];

void dfs(int y, int x, int w, int h){
    if(x < 0 || y < 0 || y >= h || x >= w) return;
    if(m[y][x] == 1 && !check[y][x]){
        check[y][x] = true;
        // cout << "[" << y << "," << x << "]" << endl;
        for(int dx = -1; dx <= 1; ++dx){
            for(int dy = -1; dy <= 1; ++ dy){
                dfs(y + dy, x + dx, w, h);
            }
        }
    }
}

int main() {
    int w, h;
    cin >> w >> h;
    
    while(w != 0 && h != 0){
        int res = 0;
        rep(i, 51) rep(j, 51){
            m[i][j] = 0;
            check[i][j] = false;
        }
        rep(i, h) rep(j, w) cin >> m[i][j];
        
        rep(i, h) rep(j, w){
            if(m[i][j] == 1 && !check[i][j]){
                ++res;
                // cout << "start[" << i << "," << j << "]" << endl; 
                dfs(i, j, w, h);
            }   
        }
        
        cout << res << endl;
        cin >> w >> h;
    }
    
    return 0;
}

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

int w,h;
int fd[50][50];

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

void dfs(int x, int y){
	fd[y][x] = 0;
	for(int i=0; i<8; i++){
		int mx = x+dx[i];
		int my = y+dy[i];
		if(0<=mx && mx<w && 0<=my && my<h && fd[my][mx])
			dfs(mx, my);
	}
}

int main(void){
	while(cin >> w >> h, w|h){
		for(int y=0; y<h; y++)
			for(int x=0; x<w; x++)
				cin >> fd[y][x];

		int count=0;
		for(int y=0; y<h; y++)
			for(int x=0; x<w; x++)
				if(fd[y][x]){
					count++;
					dfs(x,y);
				}
		
		cout << count << endl;
	}

	return 0;
}

C++: #include <bits/stdc++.h>
#define rep(i,n) for(int i=0;i<n;i++)
#define all(x) (x).begin(),(x).end()
using namespace std;
const int INF=1145141919,MOD=1e9+7;
const long long LINF=8101145141919364364;
const int dx[]={1,1,0,-1,-1,-1,0,1},dy[]={0,-1,-1,-1,0,1,1,1};

int main(){
    int w,h;
    while(cin>>w>>h&&w){
        int c[h][w]; rep(i,h)rep(j,w) cin>>c[i][j];
        int cnt=1;
        for(int i=0;i<h;i++){
            for(int j=0;j<w;j++){
                if(c[i][j]==1){
                    cnt++;
                    queue<pair<int,int>> q;
                    c[i][j]=cnt;
                    q.push({i,j});
                    while(q.size()){
                        pair<int,int> p=q.front(); q.pop();
                        int cy=p.first,cx=p.second;
                        rep(k,8){
                            int ny=cy+dy[k],nx=cx+dx[k];
                            if(0<=ny&&ny<h&&0<=nx&&nx<w&&c[ny][nx]==1){
                                c[ny][nx]=cnt;
                                q.push({ny,nx});
                            }
                        }
                    }
                }
            }
        }
        cout<<cnt-1<<endl;
    }
    return 0;
}