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++: //
// Created by elegant-belltree on 15/06/03.
//

#include <iostream>
#include <set>

using namespace std;

int main(){
    int w,h;
    int c[50][50];

    while (cin>>w>>h && (w>0 || h>0)) {
        int label=2;
        set<int> labels;

        for (int n = 0; n < 2; ++n) {
            for (int i = 0; i < h; ++i) {
                for (int j = 0; j < w; ++j) {
                    if(n==0) {
                        cin >> c[j][i];
                    }
                    if (0<c[j][i]) {
                        for (int k = -1; k < n+1; ++k) {
                            for (int l = -1; (n!=0 || k!=0 || l!=0) && l < 3 && j + l < w; ++l) {
                                if (-1 < i + k && -1 < j + l && 0 < c[j + l][i + k] && (c[j][i] == 1 || c[j + l][i + k] < c[j][i])) {
                                    if(n==1){
                                        labels.erase(c[j][i]);
                                    }
                                    c[j][i] = c[j + l][i + k];
                                }
                            }
                        }
                        if (c[j][i] == 1) {
                            c[j][i] = label++;
                            labels.insert(c[j][i]);
                        }
                    }
                }
            }
        }
        /*for (int m = 0; m < h; ++m) {
            for (int i = 0; i < w; ++i) {
                cout<<c[i][m]<<" ";
            }
            cout<<endl;
        }*/
        cout<<labels.size()<<endl;
    }
    return 0;
}

C++: #include <bits/stdc++.h>
using namespace std;
typedef long long ll;
#define i_7 (ll)(1E9+7)
#define i_5 (ll)(1E9+5)
ll mod(ll a){
    ll c=a%i_7;
    if(c>=0)return c;
    else return c+i_7;
}
typedef pair<int,int> i_i;
typedef pair<ll,ll> l_l;
ll inf=(ll)1E12;//10^12
#define rep(i,l,r) for(ll i=l;i<=r;i++)
#define pb push_back
ll max(ll a,ll b){if(a<b)return b;else return a;}
ll min(ll a,ll b){if(a>b)return b;else return a;}
const double EPS=1E-8;
////////////////////////////////////////

int w,h;
bool m[55][55];

void dfs(int k,int l){
    
    rep(i,-1,1)rep(j,-1,1){
        int x=k+i;int y=l+j;
        if(0<=x&&x<=h-1&&0<=y&&y<=w-1&&m[x][y]){
            
            m[x][y]=false;
            dfs(x,y);
        }
    }
}


int main() {
    ios::sync_with_stdio(false);cin.tie(0);
    
    while(cin>>w>>h){
        if(w==0)break;
        rep(i,0,h-1)rep(j,0,w-1)cin>>m[i][j];
        int ans=0;
        rep(i,0,h-1)rep(j,0,w-1){
            if(m[i][j]){
                ans++;
                m[i][j]=false;
                dfs(i,j);
            }
        }
        cout<<ans<<endl;
    }
    return 0;
}

C++: #include <bits/stdc++.h>
#define int long long
#define double long double
#define INF 1e18
using namespace std;
int grid[100][100];
int H, W;

void dfs(int x, int y) {
  int mx[8] = { 1, 1, 0, -1, -1, -1, 0, 1 };
  int my[8] = { 0, 1, 1, 1, 0, -1, -1, -1 };
  for (int i = 0; i < 8; i++) {
    int _x = x + mx[i];
    int _y = y + my[i];
    if (grid[_x][_y] == 1 && _x >= 0 && _y >= 0 && _x < W && _y < H) {
      grid[_x][_y] = 0;
      dfs(_x, _y);
    }
  }
}

signed main() {
  while (cin >> W >> H, W+H!=0) {
    for (int i = 0; i < H; i++) {
      for (int j = 0; j < W; j++) {
        cin >> grid[j][i];
      }
    }
 
    int ans = 0; 
    for (int i = 0; i < H; i++) {
      for (int j = 0; j < W; j++) {
        if (grid[j][i] == 1) {
          dfs(j,i);
          ans++;
        }
      }
    }

    cout << ans << endl;
  }
}

C++: #include<bits/stdc++.h>
using namespace std;
int m[50][50];
void del(int a,int b){
	m[a][b]=0;
	if(m[a-1][b]==1)del(a-1,b);
	if(m[a][b-1]==1)del(a,b-1);
	if(m[a+1][b]==1)del(a+1,b);
	if(m[a][b+1]==1)del(a,b+1);
	if(m[a-1][b-1]==1)del(a-1,b-1);
	if(m[a-1][b+1]==1)del(a-1,b+1);
	if(m[a+1][b-1]==1)del(a+1,b-1);
	if(m[a+1][b+1]==1)del(a+1,b+1);
}
int main(){
	int a,b,i,j,w,q;
	while(cin>>a>>b,a!=0&&b!=0){
		int c=0;
		for(i=0;i<b;i++)for(j=0;j<a;j++)cin>>m[i][j];
        for(i=0;i<b;i++)for(j=0;j<a;j++)if(m[i][j]==1){del(i,j);c++;}
        	cout<<c<<endl;
    }
}

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

int w,h;
int g[100][100];

void dfs(int y, int x){
  g[y][x] = 0;

  for(int i=-1;i<=1;i++){
    for(int j=-1;j<=1;j++){
      if(y+i<0 || x+j<0 || y+i>=h || x+j>=w)continue;
      if(g[y+i][x+j])dfs(y+i,x+j);
    }
  }
}

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

    int cnt = 0;
    for(int i=0;i<h;i++){
      for(int j=0;j<w;j++){
	if(g[i][j])cnt++, dfs(i,j);
      }
    }
    cout << cnt << endl;
  }
}