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;
template<class T> inline bool chmax(T& a, T b) { if (a < b) { a = b; return true; } return false; }
template<class T> inline bool chmin(T& a, T b) { if (a > b) { a = b; return true; } return false; }

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

void dfs(vector< vector<int> > &isisland, vector< vector<bool> > &vvisited, int x, int y) {
    // ここで島の色塗りを行う
    vvisited[y][x] = true;
    for(int i = 0; i < 8; ++i) {
        int nx = x+dx[i]; int ny = y+dy[i];
        if(nx >= 0 && nx < w && ny >= 0 && ny < h) {
            if(isisland[ny][nx] == 1 && !vvisited[ny][nx]) {
                dfs(isisland, vvisited, nx, ny);
            }
        }
    }
}

int main() {
    while(1) {
        cin >> w >> h;
        if(w == 0 && h == 0) break;
        else {
            vector< vector<int> > island(h, vector<int>(w, 0));
            for(int i = 0; i < h; ++i) {
                for(int j = 0; j < w; ++j) {
                    cin >> island[i][j];
                }
            }

            vector< vector<bool> > visited(h, vector<bool>(w, false));
            int total = 0;
            for(int i = 0; i < h; ++i) {
                for(int j = 0; j < w; ++j) {
                    if(island[i][j] == 1 && !visited[i][j]) {
                        total++;
                        dfs(island, visited, j, i);
                    }
                }
            }
            cout << total << endl;
        }
    }    
}

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

using namespace std;
using ll = long long;

void dfs(const vector<vector<bool>> &field, vector<vector<bool>> &visit, int x, int y, int w, int h) {
    visit[y][x] = true;
    for (int dx = -1; dx <= 1; dx++) {
        for (int dy = -1; dy <= 1; dy++) {
            if (dx == 0 && dy == 0)
                continue;
            int nx = x + dx;
            int ny = y + dy;

            if (0 <= nx && nx < w && 0 <= ny && ny < h && field[ny][nx] && !visit[ny][nx]) {
                dfs(field, visit, nx, ny, w, h);
            }
        }
    }
}

void solve() {
    int w, h;
    cin >> w >> h;
    if (w == 0 && h == 0)
        exit(0);

    vector<vector<bool>> field(h, vector<bool>(w));
    for (int i = 0; i < h; i++) {
        for (int j = 0; j < w; j++) {
            int c;
            cin >> c;
            if (c)
                field[i][j] = true;
            else
                field[i][j] = false;
        }
    }

    int ans = 0;
    vector<vector<bool>> visit(h, vector<bool>(w, false));
    for (int i = 0; i < h; i++) {
        for (int j = 0; j < w; j++) {
            if (field[i][j] && !visit[i][j]) {
                dfs(field, visit, j, i, w, h);
                ans++;
            }
        }
    }

    cout << ans << endl;
}

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

    while (true)
        solve();

    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;

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

int h,w;
void dfs(vector<vector<int>> &s,int x,int y){
  if(x<0 || x>=h || y<0 || y>=w) return;
  if(!s[x][y]) return;
  s[x][y] = 0;
  rep(i,8) dfs(s,x+dx[i],y+dy[i]);
}
  
  
int main(){
  while(1){   
    cin>>w>>h; 
    if(!h) break;
    vector<vector<int>> s(h,vector<int>(w));
    rep(i,h)rep(j,w) cin>>s[i][j];
     
    int ans = 0;
    rep(k,250){
      rep(i,h){
        rep(j,w){
          if(s[i][j]){
            dfs(s,i,j);
            ans++;
          }
        }
      }
    }
    cout << ans << endl;
  }
}