Go: // AOJ 1160: How Many Islands? http://judge.u-aizu.ac.jp/onlinejudge/description.jsp?id=1160

package main

import (
	"bufio"
	"container/list"
	"fmt"
	"os"
	"strconv"
)

var SEA = 0
var LAND = 1

func nextInt(sc *bufio.Scanner) int {
	sc.Scan()
	v, _ := strconv.Atoi(sc.Text())
	return v
}

func discoverIslands(M, V [][]int, H, W int) int {
	// 島を探す
	queue := list.New()
	islands := 0
	for i := 1; i <= H; i++ {
		for j := 1; j <= W; j++ {
			// 訪問済みの土地ならスキップ
			if V[i][j] == 1 {
				continue
			}

			// 訪問中の土地が海なら訪問済みにしてスキップ
			if M[i][j] == SEA {
				V[i][j] = 1
				continue
			}

			// 未訪問の陸地が見つかったので
			// 島の数を1つ増やし、この陸地から辿れる陸地を訪問していく
			islands++
			queue.PushBack([]int{i, j})

			for queue.Len() > 0 {
				cur := queue.Remove(queue.Front()).([]int)
				h, w := cur[0], cur[1]
				if V[h][w] == 1 {
					continue
				}
				V[h][w] = 1

				// 全方向に未訪問の陸地がないか探索
				for v := -1; v <= 1; v++ {
					for l := -1; l <= 1; l++ {
						dh := h + v
						dw := w + l
						if M[dh][dw] == LAND && V[dh][dw] == 0 {
							queue.PushBack([]int{dh, dw})
						}
					}
				}
				/*
					if M[h-1][w] == LAND {
						queue.PushBack([]int{h - 1, w})
					}
					if M[h-1][w+1] == LAND {
						queue.PushBack([]int{h - 1, w + 1})
					}
					if M[h][w+1] == LAND {
						queue.PushBack([]int{h, w + 1})
					}
					if M[h+1][w+1] == LAND {
						queue.PushBack([]int{h + 1, w + 1})
					}
					if M[h+1][w] == LAND {
						queue.PushBack([]int{h + 1, w})
					}
					if M[h+1][w-1] == LAND {
						queue.PushBack([]int{h + 1, w - 1})
					}
					if M[h][w-1] == LAND {
						queue.PushBack([]int{h, w - 1})
					}
					if M[h-1][w-1] == LAND {
						queue.PushBack([]int{h - 1, w - 1})
					}
				*/
			}
		}
	}
	return islands
}

func main() {
	sc := bufio.NewScanner(os.Stdin)
	sc.Split(bufio.ScanWords)

	for {
		W, H := nextInt(sc), nextInt(sc)

		if W == 0 && H == 0 {
			break
		}
		// Initialize map and visted list
		M := make([][]int, H+2)
		V := make([][]int, H+2)
		for i := 0; i < H+2; i++ {
			M[i] = make([]int, W+2)
			V[i] = make([]int, W+2)
		}
		for i := 1; i <= H; i++ {
			for j := 1; j <= W; j++ {
				M[i][j] = nextInt(sc)
			}
		}

		islands := discoverIslands(M, V, H, W)

		fmt.Println(islands)
	}
}

C++: #include <cstdio>
#include <cctype>
#include <utility>
#include <vector>
using namespace std;

#define gcu getchar_unlocked
#define ii inline int in
ii(int c) {
	int n = 0;
	bool minus = false; if (c == '-') minus = true, c = gcu();
	do {n = 10 * n + (c - '0'), c = gcu();} while (c >= '0');
	//return n; }
	return minus ? -n : n; }
ii() {return in(gcu());}
inline bool scan(int &n) {int c=gcu();return c==EOF?false:(n=in(c),true);}
//void scan(string &s) {for (char c; !isspace(c = gcu()); s += c);}
#undef ii
#define pcu putchar_unlocked
template <typename T>
void out(T n) {
	static char buf[20];
	char *p = buf;
	if(n < 0) pcu('-'), n *= -1;
	if (!n) *p++ = '0';
	else while (n) *p++ = n % 10 + '0', n /= 10;
	while (p != buf) pcu(*--p); }
void out(const char *s){while(*s)pcu(*s++);}
void out(char c){pcu(c);}
//void out(string &s){for (char c: s) pcu(c);}
template <typename head, typename... tail>
void out(head&& h, tail&&... t){out(h);out(move(t)...);}
template <typename T>
//void out(vector<T> &v){for(T &x:v)out(' '),out(x);out('\n');}
void out(vector<T> &v){for(T &x:v)out(&x == &v[0]?"":" "),out(x);out('\n');}
#undef svo

typedef vector<vector<int>> map;

bool walk(int x, int y, map &m) {
	static const int
		dx[] = {1, 1, 0, -1, -1, -1, 0, 1},
		dy[] = {0, 1, 1, 1, 0, -1, -1, -1};
	if (x < 0 || x >= (int) m[0].size() ||
		y < 0 || y >= (int) m.size() ||
		m[y][x] == 0)
		return false;
	m[y][x] = 0;
	int i = 0;
	for (; i < 8; i++)
		walk(x + dx[i], y + dy[i], m);
	return true;
}

int main() {
	int W, H;
	while(scan(W) && scan(H) && (W || H)) {
		map m(H, vector<int>(W));
		for (auto &v: m)
			for (int &i :v)
				i = in();
		int c = 0;
		for (int i = 0; i < H; i++)
			for (int j = 0; j < W; j++)
				if (walk(j, i, m))
					c++;
		//for (auto v : m)
		//	out(v);
		//out('\n');
		out(c, '\n');
	}
}

C++: #include <iostream>
#include <iomanip>
#include <sstream>
#include <stdio.h>
#include <list>
#include <vector>
#include <stack>
#include <queue>
#include <algorithm>
#include <math.h>
#include <utility>
#include <string>
#include <ctype.h>
#include <cstring>
#include <cstdio>
#include <sstream>
#include <functional>

using namespace std;

#define FOR(i,k,n) for(int i = (k); i < (n); i++)
#define REP(i,n) FOR(i,0,n)
#define INF 114514810
#define ll long long
//#define scanf scanf_s

int w, h;
int isl[55][55];

int di[8] = { -1, -1, -1, 0, 0, 1, 1, 1 }; int dj[8] = { -1, 0, 1, -1, 1, -1, 0, 1 };

void dfs(int i, int j)
{
	if (isl[i][j] == 1)
	{
		isl[i][j] = 0;
		REP(k, 8) dfs(i + di[k], j + dj[k]);
	}
}

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

C++: // AOJ1160
#include <bits/stdc++.h>
#define endl "\n"
#define rep(i,n) for(int i=0;i<int(n);i++)
#define SZ(x) ((int)(x).size())
#define all(x) (x).begin(),(x).end()
using namespace std;
typedef long long ll;
typedef long double ld;
typedef pair<int, int> ipair;
template <class T>ostream &operator<<(ostream &o,const vector<T>&v)
{o<<"{";for(int i=0;i<(int)v.size();i++)o<<(i>0?", ":"")<<v[i];o<<"}";return o;}
namespace you {
    std::string to_string(char val) {
        return std::string(1, val);
        // return std::string{val};
        // you::to_string(char)
    }
}
int w,h;
vector<vector<int>> ma(60,vector<int>(60));
int ans;
void dfs(int y,int x){
    if(y<0||h<=y||x<0||w<=x) return;
    if(ma[y][x]==0) return;
    ma[y][x]=0; //陸を海にしちゃう
    for(int i=-1;i<=1;i++){
        for(int j=-1;j<=1;j++){
            dfs(y+i,x+j);
        }
    }
}
int main() {
    cin.tie(0);
    ios::sync_with_stdio(false);
    cout << fixed << setprecision(12);

    while(cin>>w>>h){
        ans=0;
        if(w==0 && h==0) break;
        rep(y,h){
            rep(x,w){
                cin>>ma[y][x];
            }
        }
        rep(y,h){
            rep(x,w){
                if(ma[y][x]==0) continue;
                dfs(y,x);
                ans++;
            }
        }
        cout<<ans<<endl;
    }
    return 0;
}

C++: #include <iostream>
#include <stdio.h>
#include <vector>
#include <utility>
#include <string>
#include <algorithm>
#include <cmath>
#include <queue>
#include <cstring>
 
typedef long long ll;

#define rep(i,n) for(ll i = 0; i < n; i++)
 
using namespace std;
 
const ll INF = ll(1e18)+1;
const double PI=3.14159265358979323846;

int w,h,C[100][100], dx[8]={-1,1,0,0,-1,-1,1,1}, dy[8]={0,0,1,-1,-1,1,-1,1};
bool seen[100][100];

void dfs(int x, int y){
  seen[x][y] = true;
  rep(i,8){
    int movex = x+dx[i], movey = y+dy[i];
    if((movex<0 && w<=movex) || (movey<0 && h<=movey) || \
       seen[movex][movey] || C[movex][movey] == 0) continue;
    dfs(movex, movey);
  }
}

int main(){
  while(1){
    cin >> w >> h;
    if(!w && !h) break;
    rep(i,h) rep(j,w){
      cin >> C[i][j];
    }
    int ans = 0;
    rep(i,h) rep(j,w){
      if(seen[i][j] || C[i][j] == 0) continue;
      else{
	dfs(i,j);
	ans++;
      }
    }
    cout << ans << endl;
    memset(C, 0, sizeof(C));
    memset(seen, false, sizeof(seen));
  }
}