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>
using namespace std;
#define OUT(x) cout<<x<<endl
#define DEBUG(x) cout<<#x<<": "<<x
const int BA = 1000;
const int INFTY = (1<<21);
int c[51][51];
int w,h;
int del(int x,int y){
  if(x<0)return 0;
  if(c[x][y]){
    c[x][y] = 0;
    return del(x+1,y)+del(x,y+1)+del(x+1,y+1)+del(x-1,y+1);
    
  }
  else return 0;
  
}
int solve(int x,int y){
  if(x==0 && y == h)return 0;
  else if(x==w){
    return solve(0,y+1);
  }
  else if(c[x][y]==1){
    del(x,y);
    return solve(x+1,y)+1;
  }
  else return solve(x+1,y);
}
int main(){
  while(cin>>w>>h&&w&&h){
    for(int i=0;i<h;i++){
      for(int j=0;j<w;j++){
	cin >> c[i][j];
      }
    }
    cout << solve(0,0) << endl;
  }
}

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

int w, h;
bool data[99][99]; //y,x

int solve(int x, int y){

  if(x < 0 || y < 0 || x == w || y == h) return 0;
  if(!data[y][x]) return 0;

  data[y][x] = false;

  for(int i=-1;i<2;i++) for(int j=-1;j<2;j++) solve(x+j, y+i);

  return 1;
}

int main(){

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

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

    int ret = 0;
    for(int i=0;i<h;i++) for(int j=0;j<w;j++) if(data[i][j]) ret += solve(j, i);

    cout << ret << endl;
  }

}

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

struct UnionFind{
    vector<int> data;

    UnionFind(int N) : data(vector<int>(N,-1)){}

    int root(int x){
        if(data[x] < 0){
            return x;
        }else{
            return data[x] = root(data[x]);
        }
    }

    bool same(int x,int y){
        return root(x) == root(y);
    }

    void unite(int x,int y){
        if(!same(x,y)){
            x = root(x);
            y = root(y);
            if(data[x] < data[y]){
                data[x] += data[y];
                data[y] = x;
            }else{
                data[y] += data[x];
                data[x] = y;
            }
        }
        return;
    }

};

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

void solve(int w,int h){
    swap(w,h);
    int c[w][h];
    for(int i = 0;i < w;i++){
        for(int j = 0;j < h;j++){
            cin >> c[i][j];
        }
    }
    UnionFind uf(w*h);
    for(int i = 0;i < w;i++){
        for(int j = 0;j < h;j++){
            for(int k = 0;k < 8;k++){
                int x = i + dx[k];
                int y = j + dy[k];
                if(0 <= x && x < w && 0 <= y && y < h){
                    if(c[i][j] && c[x][y]){
                        uf.unite(i*h+j,x*h+y);
                    }
                }
            }
        }
    }
    set<int> s;
    for(int i = 0;i < w*h;i++)s.insert(uf.root(i));
    int ans = 0;
    for(auto x:s){
        ans += c[x/h][x%h];
    }
    cout << ans << endl;
}

int main(){
    int w,h;
    while(true){
        cin >> w >> h;
        if(!w && !h)return 0;
        solve(w,h);
    }
}

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

struct mapst {
	int x, y;
};

#define func(x,y) (c[y][x]&&!f[y][x])

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(func(j,i)) {
				mapst m, ms;
				m.x = j; m.y = i;
				q.push(m);
				ans++;
				do {
					m = q.front();
					q.pop();
					f[m.y][m.x] = 1;
					for(int k=0; k<8; k++) {
						if(func(m.x+dx[k],m.y+dy[k])) {
							ms.x = m.x+dx[k]; ms.y = m.y+dy[k];
							q.push(ms);
						}
					}
				}while(!q.empty());
			}
		}
		cout << ans << endl;
	}
	return 0;
}

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;
}