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;
typedef long long ll;
// #define int long long

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

#define REP(i, n) for (int i = 0; i < (n); ++i)
#define RREP(i, n) for (int i = (n); i >= 0; --i)
#define FOR(i, a, b) for (int i = (a); i < (b); ++i)
#define RFOR(i, a, b) for (int i = (a); i >= (b); --i)
#define ALL(v) (v).begin(), (v).end()
#define RALL(a) (a).rbegin(), (a).rend()
#define debug(x) cerr << #x << " = " << (x) << " (L" << __LINE__ << ")" \
                      << " " << __FILE__ << endl;

typedef vector<int> vi;
typedef vector<string> vs;
typedef vector<vi> vvi;
typedef pair<int, int> pii;

int dh[] = {-1, -1, -1, 0, 0, 1, 1, 1};
int dw[] = {-1, 0, 1, -1, 1, -1, 0, 1};

vvi m;
int cnt;
vector<vector<bool>> visited;

void next(int h, int w) {
    if (m[h][w] == 0) return;
    if (visited[h][w]) return;
    visited[h][w] = true;

    REP(i, 8) {
        int nh = h + dh[i];
        int nw = w + dw[i];
        if (!INRANGE(nh, 0, (int)m.size()-1)) continue;
        if (!INRANGE(nw, 0, (int)m[0].size()-1)) continue;
        next(nh, nw);
    }
}

void dfs(int h, int w) {
    if (m[h][w] == 0) return;
    if (visited[h][w]) return;
    visited[h][w] = true;

    cnt++;
    REP(i, 8) {
        int nh = h + dh[i];
        int nw = w + dw[i];
        if (!INRANGE(nh, 0, (int)m.size()-1)) continue;
        if (!INRANGE(nw, 0, (int)m[0].size()-1)) continue;
        next(nh, nw);
    }
}

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

    while (true)
    {
        int w, h;
        cin >> w >> h;
        if (w == 0 and h == 0) break;

        m = vvi();
        REP(_, h) {
            vi l(w);
            //cin >> l;
            REP(i, w) cin >> l[i];
            m.emplace_back(l);
        }

        visited = vector<vector<bool>>(h, vector<bool>(w, false));
        cnt = 0;
        REP(hi, h) {
            REP(wi, w) {
                dfs(hi, wi);
            }
        }

        cout << cnt << endl;
    }
    
    


    return 0;
}

C++: #include <stdio.h>
#include <stack>

#define MAX_W 50
#define MAX_H 50
#define LAND 1
#define SEA 0
int map[MAX_H][MAX_W];
int h, w;
using namespace std;
stack<int> x, y;

bool input() {
  int i, j;

  scanf("%d %d", &w, &h);
  if (w == 0 && h == 0) return false;
  for (i = 0; i < h; i++) {
    for (j = 0; j < w; j++) {
      scanf("%d", &map[i][j]);
    }
  }

  return true;
}

int main() {
  int i, j, cnt;

  while (input()) {
    cnt = 0;
    for (i = 0; i < h; i++) {
      for (j = 0; j < w; j++) {
        if (map[i][j] == LAND) {
          cnt++;
          x.push(j);
          y.push(i);
          while (!x.empty() && !y.empty()) {
            int a = x.top();
            x.pop();
            int b = y.top();
            y.pop();
            if (a < 0 || w <= a || b < 0 || h <= b || map[b][a] == SEA)
              continue;
            map[b][a] = SEA;
            x.push(a - 1);
            y.push(b - 1);
            x.push(a - 1);
            y.push(b);
            x.push(a - 1);
            y.push(b + 1);
            x.push(a);
            y.push(b - 1);
            x.push(a);
            y.push(b + 1);
            x.push(a + 1);
            y.push(b - 1);
            x.push(a + 1);
            y.push(b);
            x.push(a + 1);
            y.push(b + 1);
          }
        }
      }
    }
    printf("%d\n", cnt);
  }

  return 0;
}