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>

int w, h;
int map[50][50];

void dfs(int y, int x){
  map[y][x] = 0;
  for(int dy=-1; dy <= 1; dy++){
    for(int dx=-1; dx <= 1; dx++){
      if(0 <= y+dy && y+dy < h && 0 <= x+dx && x+dx < w && map[y+dy][x+dx] == 1){
        dfs(y+dy, x+dx);
      }
    }
  }
}

int main(void){
  while(1){
    int cnt = 0;
    std::cin >> w >> h;
    if(w == 0 && h == 0)  return 0;
    for(int i=0; i < h; i++){
      for(int j=0; j < w; j++){
        std::cin >> map[i][j];
      }
    }

    for(int i=0; i < h; i++){
      for(int j=0; j < w; j++){
        if(map[i][j] == 1){
          cnt++;
          dfs(i, j);
        }
      }
    }

    std::cout << cnt << std::endl;

  }
}

C++: #include<bits/stdc++.h>
using namespace std;
#define inf 1e9
#define ll long long
#define ull unsigned long long
#define M 1000000007
#define P pair<int,int>
#define PLL pair<ll,ll>
#define FOR(i,m,n) for(int i=m;i<n;i++)
#define RFOR(i,m,n) for(int i=m;i>=n;i--)
#define rep(i,n) FOR(i,0,n)
#define rrep(i,n) RFOR(i,n,0)
#define all(a) a.begin(),a.end()
const int vx[4] = {0,1,0,-1};
const int vy[4] = {1,0,-1,0};
#define PI 3.14159265


void f(int w,int h){
  int map[100][100]={};
  bool c[100][100]={};

  rep(i,h){
    rep(j,w){
      cin>>map[i][j];
    }
  }

  int ans=0;
  rep(i,h){
    rep(j,w){
      if(map[i][j]&&!c[i][j]){
        
        queue<P> q;
        q.push(P(i,j));
        while(q.size()){
          P p=q.front(); q.pop();
          int a=p.first,b=p.second;
          for(int k=-1;k<2;k++){
            for(int l=-1;l<2;l++){
              int y=a+k;
              int x=b+l;
              if(0<=x&&x<w&&0<=y&&y<h)
              if(map[y][x]&&!c[y][x]){
                c[y][x]=true;
                q.push(P(y,x));
              }
            }
          }
        }
        ans++;
      }
    }
  }

  cout<<ans<<endl;
}

int main(){
  int w,h;
  while(1){
    cin>>w>>h;
    if(w==0) break;
    f(w,h);
  }

  return 0;
}

C++: #include<iostream>
using namespace std;

//int Flag=0;

void find_island(int *cp){
//	int length=cp-c1;

	*cp=0;
	
	if(*(cp+1)==1) find_island(cp+1);
	if(*(cp+52)==1)find_island(cp+52);
	if(*(cp+53)==1)find_island(cp+53);
	if(*(cp-1)==1)find_island(cp-1);
	if(*(cp-51)==1)find_island(cp-51);
	if(*(cp-52)==1)find_island(cp-52);
	if(*(cp-53)==1)find_island(cp-53);
	if(*(cp+51)==1)find_island(cp+51);	
}


int main()
{
	int w,h;

	cin>>w>>h;
	while( w!=0 || h!=0 ){
		int c[52][52]={},island=0;
		for(int i=1;i<=h;i++){
			for(int j=1;j<=w;j++){
				cin>>c[i][j];
			}
		}

		for(int i=1;i<=h;i++){
			for(int j=1;j<=w;j++){
				if(c[i][j]==1){
					island++;
					find_island(&c[i][j]);
				}
			}
		}
		cout<<island<<endl;
		cin>>w>>h;
	}
}

C++: #include <bits/stdc++.h>
using namespace std;
using ll=long long;
typedef pair<int,int> P;
template<class T> inline bool chmax(T& a, T b) { if (a < b) { a = b; return 1; } return 0; }
template<class T> inline bool chmin(T& a, T b) { if (a > b) { a = b; return 1; } return 0; }
int w,h;
int nx,ny;
vector<vector<int>>G;
void dfs(int a,int b){
     if(0>nx|| nx>=h || 0>ny|| ny>=w) return ;
     if( G.at(nx).at(ny)==0) return ; 
     G.at(a).at(b)=0;
    for(int k=-1;k<=1;k++){
        for(int s=-1;s<=1;s++){
            nx=a+k;
            ny=b+s;
            dfs(nx,ny);
        }
    }
}
 
 
 
int main(){
    cin>>w>>h;
    G.resize(h,vector<int>(w));
    for(int i=0;i<h;i++){
        for(int j=0;j<w;j++){
            cin>>G.at(i).at(j);
        }
    }
    int count=0;
    for(int i=0;i<h;i++){
        for(int j=0;j<w;j++){
            if(G.at(i).at(j)==1){
                count++;
                dfs(i,j);
            }
        }
    }
cout<<count<<endl;
}

C++: #include <iostream>

#define REP(i,n) for(int i=0; i<n; i++)
#define debug(x) cerr << #x << " = " << (x) << endl;

using namespace std;

int w, h, map[51][51], diff[9]={-1, 0, 1, 0, -1, 1, 1, -1, -1};

bool check(int j, int k){
	return (j>=0 && j<h && k>=0 && k<w && map[j][k]>0);
}

void dfs(int j, int k){
	REP(i,8){
		if (check(j+diff[i], k+diff[i+1])){
			map[j+diff[i]][k+diff[i+1]] = 0;
			dfs(j+diff[i],k+diff[i+1]);
		}
	}
	return;
}

int main(){
	while(1){
		int ans=0;
		cin >> w >> h;
		if (w==0 && h==0) break;
		REP(j,h){
			REP(k,w) map[j][k] = 0;
		}
		REP(j,h){
			REP(k,w) cin >> map[j][k];
		}
		REP(j,h){
			REP(k,w){
				if (check(j,k)){
					ans++;
					dfs(j,k);
				}
			}
		}
		cout << ans << endl;
	}
	return 0;
}