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 <bits/stdc++.h>
#include <math.h>

using namespace std;

long long inf=1000000007;
long long h,w;

void dfs(long long y,long long x,vector<vector<bool>> &seen,vector<vector<long long>> grid){
	vector<long long> dy={1,1,1,0,0,-1,-1,-1};
	vector<long long> dx={1,0,-1,1,-1,1,0,-1};

	for(long long i=0;i<8;i++){
		long long py=y+dy.at(i);
		long long px=x+dx.at(i);

		if(py<0 || py>=h || px<0 || px>=w || grid.at(py).at(px)==0 || seen.at(py).at(px)) continue;

		seen.at(py).at(px)=true;
		dfs(py,px,seen,grid);
	}
}

int main(){
	cin>>w>>h;

	while(h!=0 || w!=0){
		vector<vector<long long>> grid(h,vector<long long>(w));
		for(long long i=0;i<h;i++){
			for(long long j=0;j<w;j++){
				cin>>grid.at(i).at(j);
			}
		}

		vector<vector<bool>> seen(h,vector<bool>(w,false));
		long long ans=0;

		for(long long i=0;i<h;i++){
			for(long long j=0;j<w;j++){
				if(grid.at(i).at(j)==0 || seen.at(i).at(j)) continue;
				ans++;
				seen.at(i).at(j)=true;
				dfs(i,j,seen,grid);
			}
		}

		cout<<ans<<endl;
		cin>>w>>h;
	}

	return 0;
}

C++: #include <iostream>
#include <algorithm>
#include <vector>
#include <stack>
#include <queue>
#include <map>
#include <cmath>
#include <string>
#include <sstream>
#include <iomanip>
#include <complex>
using namespace std;
 
#define ll long long
#define vvi vector< vector<int> >
#define All(X) X.begin(),X.end()
#define FOR(i,a,b) for(int i=(int)(a);i<(int)(b);i++)
#define REP(i,n) for(int i=0;i<(int)(n);i++)
#define pb push_back 
ll gcd(ll a,ll b){return b?gcd(b,a%b):a;}
ll lcm(ll a,ll b){return a/gcd(a,b)*b;}

int w,h;
int c[100][100];
bool notsearched[100][100];
int dx[8]={0,1,0,-1,1,1,-1,-1};
int dy[8]={1,0,-1,0,1,-1,1,-1};
int ans;

bool inrange(int x, int y){
  if(x<0||y<0||x>=h||y>=w){ 
	//cout << "false" <<endl;
	return false;
  }else{ 
	//cout << "true" << endl;
	return true;
  }
}

void search(int x, int y){

  if((notsearched[x][y])&&(c[x][y] == 1)&&(inrange(x,y))){
	notsearched[x][y]=false;

	REP(i,8) search(x+dx[i],y+dy[i]);
  }
}


int main(){
  while(1){

	REP(i,100){
	  REP(j,100){
		notsearched[i][j]=true;
	  }
	}

	cin >> w >> h;
	if (w==0&&h==0) break;
	ans=0;
	REP(i,h){
	  REP(j,w){
		cin >> c[i][j];

	  }
	}

	REP(i,h){
	  REP(j,w){
		if((notsearched[i][j])&&(c[i][j] == 1)&&(inrange(i,j))) ans++; 
		search(i,j);
	  }
	}
	cout << ans << endl;
  }
 
}

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

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

void dfs(int x, int y) {
  c[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 < h && 0 <= ny && ny < w && c[nx][ny] == 1)
        dfs(nx, ny);
    }
  }
  return;
}

int main() {
  while (true) {
    cin >> w >> h;
    if (w == 0 && h == 0) break;
    for (int i = 0; i < h; i++)
      for (int j = 0; j < w; j++)
        cin >> c[i][j];
    int islands = 0;
    for (int i = 0; i < h; i++) {
      for (int j = 0; j < w; j++) {
        if (c[i][j] == 1) {
          islands++;
          dfs(i, j);
        }
      }
    }
    cout << islands << endl;
  }
  return 0;
}

C++: #include<iostream>
#include<iomanip>
#include<algorithm>
#include<cstdio>
#include<cmath>
#include<map>
#include<numeric>
#include<set>
#include<string>
#include<utility>
#include<vector>
#include<queue>


#define rep(i, a, n)  for(int i=a; i<n; i++)
#define per(i, a, n)  for(int i=n-1; i>=a; i--)
#define fill0(n)  setfill('0') << right << setw(n)
#define all(x)  (x).begin(), (x).end()
#define rall(x) (x).rbegin(), (x).rend()
#define MAX 1000001
using namespace std;
typedef long long ll;

int w,h;
int c[51][51];

void dfs(int y,int x){
  if(y<1||51<=y||x<1||51<=x||c[y][x]==0)return;
  c[y][x]=0;
  dfs(y-1, x-1);
  dfs(y-1, x);
  dfs(y-1, x+1);
  dfs(y, x-1);
  dfs(y, x+1);
  dfs(y+1, x-1);
  dfs(y+1, x);
  dfs(y+1, x+1);
}

int main(){
  while(true){
    std::cin >> w>>h;
    if(w==0&&h==0)break;
    rep(i,1,h+1){
      rep(j,1,w+1){
        std::cin >> c[i][j];
      }
    }
    int res=0;
    rep(i,1,h+1){
      rep(j,1,w+1){
        // std::cout << c[1][1] << '\n';
        if(c[i][j]==1){
          // std::cout << "/* message */" << '\n';
          dfs(i,j);
          res++;
        }
      }
    }
    std::cout << res << '\n';
  }
  return 0;
}