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 <algorithm>
# include <cassert>
# include <cctype>
# include <cstdio>
# include <cstdlib>
# include <cstring>
# include <cmath>
# include <iostream>
# include <map>
# include <queue>
# include <set>
# include <sstream>
# include <stack>
# include <string>
# include <vector>
# include <iomanip>

# define rep(i, n) for (int i = 0; i < (int)(n); i++)
# define irep(i, n) for (int i = int(n) - 1; i >= 0; i--)
# define FOR(i, m, n) for (int i = int(m); i < (int)(n); i++)

using namespace std;
int w, h, ans;

template <typename T>
void show_all(T t) {
  rep (i, t.size()) {
    rep (j, t[0].size()) {
      cout << setfill('0') << setw(5) << t[i][j] << ' ';
    }
    cout << endl;
  }
  cout << endl;
}


void dfs(vector<vector<int>> &c, int i, int j) {
  vector<int> next_i = {0, 1, 1, 1, 0, -1, -1, -1};
  vector<int> next_j = {1, 1, 0, -1, -1, -1, 0, 1};

  rep (k, 8) {
    int ii = i + next_i[k];
    int jj = j + next_j[k];

    if (0 <= ii && 0 <= jj && ii < c.size() && jj < c[0].size() && c[ii][jj] == 1) {
      c[ii][jj] = 1000;
      dfs(c, ii, jj);
    }
  }
}


int main() {

  while (cin >> w >> h && w && h) {
    vector<vector<int>> c;
    ans = 0;

    rep (i, h) c.push_back(vector<int>(w));
    rep (i, h) {
      rep (j, w) {
        cin >> c[i][j];
      }
    }

    rep (i, h) {
      rep (j, w) {
        if (c[i][j] == 1) {
          ans++;
          c[i][j] = 1000;
          dfs(c, i, j);
        }
      }
    }

    cout << ans << endl;
  }
}

C++: #include<iostream>
using namespace std;
void kazoe(int p,int P, int box[50][50]){
  if(box[p][P+1]==1){
    box[p][P+1]=0;
    P=P+1;
    kazoe(p,P,box);
  }
  if(box[p+1][P+1]==1){
    box[p+1][P+1]=0;
    P=P+1;
    p=p+1;
 kazoe(p,P,box);
  }
  if(box[p+1][P]==1){
    box[p+1][P]=0;
    p=p+1;
 kazoe(p,P,box);
  }
  if(box[p+1][P-1]==1){
    box[p+1][P-1]=0;
    P=P-1;
    p=p+1;
 kazoe(p,P,box);
  }
  if(box[p][P-1]==1){
    box[p][P-1]=0;
    P=P-1;
 kazoe(p,P,box);
  }
  if(box[p-1][P-1]==1){
    box[p-1][P-1]=0;
    P=P-1;
    p=p-1;
 kazoe(p,P,box);
  }
  if(box[p-1][P]==1){
    box[p-1][P]=0;
    p=p-1;
 kazoe(p,P,box);
  }
  if(box[p-1][P+1]==1){
    box[p-1][P+1]=0;
    P=P+1;
    p=p-1;
 kazoe(p,P,box);
  }
}
int main(){
  int w,h,i,I,p,P,a=0;
  int box[50][50];
  while(1){
    cin>>w>>h;
    if(w==0&&h==0) break;
    for(i=0;i<h;i++){
      for(I=0;I<w;I++){
	cin>>box[i][I];
      }
    }
    for(i=0;i<h;i++){
      for(I=0;I<w;I++){
	if(box[i][I]==1){
	  p=i;
	  P=I;
	  box[p][P]=0;
	  kazoe(p,P,box);
	  box[i][I]=1;
	}
      }
    }
    for(i=0;i<h;i++){
      for(I=0;I<w;I++){
	if(box[i][I]==1) a++;
      }
    }
  
    cout<<a<<endl;
    a=0;
  }
  return 0;
}

C++: #include <bits/stdc++.h>
#define REP(i, n) for (int i = 0; i < n; ++i)
#define REPR(i, n) for (int i = n - 1; i >= 0; --i)
#define FOR(i, a, b) for (int i = a; i < b; ++i)
#define FORR(i, a, b) for (int i = b - 1; i >= a; --i)
#define SORT(v) sort(v.begin(), v.end())
#define SORTR(v) sort(v.rbegin(), v.rend())
#define REV(v) reverse(v.begin(), v.end())
#define ITER(itr, v) for (auto itr = v.begin(); itr != v.end(); ++itr)
#define LB(v, x) (lower_bound(v.begin(), v.end(), x) - v.begin())
#define UB(v, x) (upper_bound(v.begin(), v.end(), x) - v.begin())
#define SZ(v) (int)v.size()
using namespace std;
using ll = long long;
using P = pair<int, int>;

class Grid {
	int h, w;
	vector<vector<int>> c;
	const int di[8] = {1, 1, 0, -1, -1, -1, 0, 1};
	const int dj[8] = {0, 1, 1, 1, 0, -1, -1, -1};

public:
	Grid(int h, int w) : h(h), w(w), c(h, vector<int>(w)) {}
	void input() {
		REP(i, h) {
			REP(j, w) {
				cin >> c[i][j];
			}
		}
	}
	int dfs(int i, int j) {
		if (c[i][j] == 0) return 0;
		c[i][j] = 0;
		REP(k, 8) {
			int u = i + di[k];
			int v = j + dj[k];
			if (u >= 0 && u < h && v >= 0 && v < w) {
				dfs(u, v);
			}
		}
		return 1;
	}
	int ans() {
		int res = 0;
		REP(i, h) {
			REP(j, w) {
				res += dfs(i, j);
			}
		}
		return res;
	}
};

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

	while (true) {
		int h, w;
		cin >> w >> h;
		if (h == 0 && w == 0) break;
		Grid grid(h, w);
		grid.input();
		cout << grid.ans() << endl;
	}

	return 0;
}