Go: package main

import (
	"bufio"
	"fmt"
	"io"
	"math"
	"os"
	"strconv"
)

var (
	readString func() string
	readBytes  func() []byte
	stdout     *bufio.Writer
)

func init() {
	readString, readBytes = newReadString(os.Stdin)
	stdout = bufio.NewWriter(os.Stdout)
}

func newReadString(ior io.Reader) (func() string, func() []byte) {
	r := bufio.NewScanner(ior)
	r.Buffer(make([]byte, 1024), math.MaxInt32)
	r.Split(bufio.ScanWords)

	f1 := func() string {
		if !r.Scan() {
			panic("Scan failed")
		}
		return r.Text()
	}
	f2 := func() []byte {
		return []byte(f1())
	}
	return f1, f2
}

func readInt() int {
	return int(readInt64())
}

func readInt64() int64 {
	i, err := strconv.ParseInt(readString(), 10, 64)
	if err != nil {
		panic(err.Error())
	}
	return i
}

func readFloat64() float64 {
	f, err := strconv.ParseFloat(readString(), 64)
	if err != nil {
		panic(err.Error())
	}
	return f
}

func printf(f string, args ...interface{}) (int, error) {
	return fmt.Fprintf(stdout, f, args...)
}

func println(args ...interface{}) (int, error) {
	return fmt.Fprintln(stdout, args...)
}

func eprintln(args ...interface{}) (int, error) {
	return fmt.Fprintln(os.Stderr, args...)
}

func eprintf(f string, args ...interface{}) (int, error) {
	return fmt.Fprintf(os.Stderr, f, args...)
}

func min(a, b int) int {
	if a < b {
		return a
	}
	return b
}

func min64(a, b int64) int64 {
	if a < b {
		return a
	}
	return b
}

func max(a, b int) int {
	if a < b {
		return b
	}
	return a
}

func max64(a, b int64) int64 {
	if a < b {
		return b
	}
	return a
}

func abs(a int) int {
	if a < 0 {
		return -a
	}
	return a
}

func abs64(a int64) int64 {
	if a < 0 {
		return -a
	}
	return a
}

func gcd(a, b int) int {
	if b == 0 {
		return a
	}
	return gcd(b, a%b)
}

func gcd64(a, b int64) int64 {
	if b == 0 {
		return a
	}
	return gcd64(b, a%b)
}

// readString() string
// readInt() int
// readInt64() int64
// readFloat64() float64

// -----------------------------------------------------------------------------

func main() {
	defer stdout.Flush()

	for {
		ans, ok := solve()
		if !ok {
			break
		}
		println(ans)
	}

}

func solve() (int, bool) {
	w := readInt()
	h := readInt()
	if w == 0 && h == 0 {
		return 0, false
	}

	c := make([][]int, h+2)
	c[0] = make([]int, w+2)
	c[h+1] = make([]int, w+2)
	for i := 1; i-1 < h; i++ {
		c[i] = make([]int, w+2)
		for j := 1; j-1 < w; j++ {
			c[i][j] = readInt()
		}
	}

	var ans int
	for i := 1; i-1 < h; i++ {
		for j := 1; j-1 < w; j++ {
			if 0 < c[i][j] {
				ans++
				dfs(c, i, j)
			}
		}
	}
	return ans, true
}

func dfs(c [][]int, y, x int) {
	c[y][x] = 0
	dx := []int{-1, 0, 1, -1, 1, -1, 0, 1}
	dy := []int{-1, -1, -1, 0, 0, 1, 1, 1}
	for i := range dx {
		nx := x + dx[i]
		ny := y + dy[i]
		if 0 < c[ny][nx] {
			dfs(c, ny, nx)
		}
	}
}

// -----------------------------------------------------------------------------

C++: #include<iostream>
#include<cmath>
#include<algorithm>

using namespace std;

int w,h;
bool grid[50][50];

void rec(int x,int y){
  grid[y][x]=false;
  for(int i=-1;i<2;i++){
    for(int j=-1;j<2;j++){
      int ny=y+i,nx=x+j;
      if(0<=nx && nx<w && 0<=ny && ny<h)
	if(grid[ny][nx])rec(nx,ny);
    }
  }
}

int main(void){

  while(cin >> w >> h,w|h){
    for(int i=0;i<h;i++){
      for(int j=0;j<w;j++){
	cin >> grid[i][j];
      }
    }
    
    int ans=0;
    for(int i=0;i<h;i++){
      for(int j=0;j<w;j++){
	if(grid[i][j])rec(j,i),ans++;
      }
    }
    cout << ans << endl;
  }

  return 0;
}

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

#define int long long

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

signed main()
{
    int w, h;
    while(cin>>w>>h, w) {
        int field[h+1][w+1];
        for(int i=0; i<h; ++i) {
            for(int j=0; j<w; ++j) {
                int c;
                cin >> c;
                field[i][j] = c;
            }
        }

        int ans = 0;
        for(int i=0; i<h; ++i) {
            for(int j=0; j<w; ++j) {
                if(field[i][j]==1) {
                    ans++;
                    queue<pair<int, int> > q;
                    q.push(make_pair(i, j));
                    while(!q.empty()) {
                        pair<int, int> p = q.front();
                        q.pop();
                        int x = p.first;
                        int y = p.second;
                        field[x][y] = 0;
                        for(int k=0; k<8; ++k) {
                            int nx = x + dx[k];
                            int ny = y + dy[k];
                            if(nx>=0&&nx<h&&ny>=0&&ny<w&&field[nx][ny]==1) {
                                q.push(make_pair(nx, ny));
                            }
                        }
                    }
                }
            }
        }

        cout << ans << endl;
    }
    return 0;
}

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

using namespace std;

int field[50][50];
int N,M;
void dfs(int x,int y){
    field[x][y]=0;
    for(int dx=-1;dx<=1;dx++){
        for(int dy=-1;dy<=1;dy++){
            int nx=x+dx,ny=y+dy;
            if(0<=nx&&nx<N&&0<=ny&&ny<M&&field[nx][ny]==1)dfs(nx,ny);
        }
    }
}
int main(){
    for(;;) {
        cin>>M>>N;
        if(N==0)break;
        rep(i,N){
            rep(j,M){
                cin>>field[i][j];
            }
        }
        int res = 0;
        for (int i = 0; i < N; i++) {
            for (int j = 0; j < M; j++) {
                if (field[i][j] == 1) {
                    dfs(i, j);
                    res++;
                }
            }
        }
        cout << res << endl;
    }
}

C++: #include<iostream>
using namespace std;
int Island[52][52];
void solve(int y,int x) {
	Island[y][x] = 0;
	for (int i = -1; i <= 1; ++i) {
		for (int j = -1; j <= 1; ++j) {
			if (Island[y + i][x + j]) solve(y + i, x + j);
		}
	}
}
int main() {
	int w,h;
	while (cin >> w >> h&&w&&h) {
		int cnt = 0;
		for (int i = 0; i < h + 2; ++i) {
			for (int j = 0; j < w + 2; ++j) {
				if (i == 0 || j == 0 || i == h + 1 || j == w + 1) Island[i][j] = 0;
				else cin >> Island[i][j];
			}
		}
		for (int i = 1; i < h + 1; ++i) {
			for (int j = 1; j < w + 1; ++j) {
				if (Island[i][j]) {
					solve(i, j);
					++cnt;
				}
			}
		}
		cout << cnt << endl;
	}
	return 0;
}