Go: package main

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

func getScanner(fp *os.File) *bufio.Scanner {
	scanner := bufio.NewScanner(fp)
	scanner.Split(bufio.ScanWords)
	scanner.Buffer(make([]byte, 1000005), 1000005)
	return scanner
}

func getNextString(scanner *bufio.Scanner) string {
	scanner.Scan()
	return scanner.Text()
}

func getNextInt(scanner *bufio.Scanner) int {
	i, _ := strconv.Atoi(getNextString(scanner))
	return i
}

func getNextInt64(scanner *bufio.Scanner) int64 {
	i, _ := strconv.ParseInt(getNextString(scanner), 10, 64)
	return i
}

func getNextUint64(scanner *bufio.Scanner) uint64 {
	i, _ := strconv.ParseUint(getNextString(scanner), 10, 64)
	return i
}

func getNextFloat64(scanner *bufio.Scanner) float64 {
	i, _ := strconv.ParseFloat(getNextString(scanner), 64)
	return i
}

func main() {
	fp := os.Stdin
	wfp := os.Stdout
	cnt := 0

	if os.Getenv("MASPY") == "ますピ" {
		fp, _ = os.Open(os.Getenv("BEET_THE_HARMONY_OF_PERFECT"))
		cnt = 0
	}
	if os.Getenv("MASPYPY") == "ますピッピ" {
		wfp, _ = os.Create(os.Getenv("NGTKANA_IS_GENIUS10"))
	}

	scanner := getScanner(fp)
	writer := bufio.NewWriter(wfp)
	for solve(scanner, writer) {

	}
	for i := 0; i < cnt; i++ {
		fmt.Fprintln(writer, "-----------------------------------")
		solve(scanner, writer)
	}
	writer.Flush()
}

func solve(scanner *bufio.Scanner, writer *bufio.Writer) bool {
	sol := solver{}
	sol.w = getNextInt(scanner)
	sol.h = getNextInt(scanner)
	if sol.w == 0 && sol.h == 0 {
		return false
	}
	sol.land = makeInts(sol.h, sol.w)
	for y := 0; y < sol.h; y++ {
		for x := 0; x < sol.w; x++ {
			sol.land[y][x] = getNextInt(scanner)
		}
	}
	ans := 0
	for y := 0; y < sol.h; y++ {
		for x := 0; x < sol.w; x++ {
			if sol.land[y][x] == 0 {
				continue
			}
			ans++
			sol.dfs(y, x)
		}
	}
	fmt.Fprintln(writer, ans)
	return true
}

type solver struct {
	w, h int
	land [][]int
}

func (sol *solver) dfs(y, x int) {
	if y < 0 {
		return
	}
	if y >= sol.h {
		return
	}
	if x < 0 {
		return
	}
	if x >= sol.w {
		return
	}
	if sol.land[y][x] == 0 {
		return
	}
	sol.land[y][x] = 0
	dy := [8]int{-1, -1, -1, 0, 0, 1, 1, 1}
	dx := [8]int{-1, 0, 1, -1, 1, -1, 0, 1}
	for i := 0; i < 8; i++ {
		sol.dfs(y+dy[i], x+dx[i])
	}
}
func makeInts(h, w int) [][]int {
	index := make([][]int, h, h)
	data := make([]int, h*w, h*w)
	for i := 0; i < h; i++ {
		index[i] = data[i*w : (i+1)*w]
	}
	return index
}

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

#define inRange(x,a,b) (a <= x && x < b)
int di[8] = {0,0,1,-1,1,1,-1,-1};
int dj[8] = {1,-1,0,0,1,-1,1,-1};

int main(){
    int w, h;
    while(cin >> w >> h, w+h){
        char mat[h][w];
        for(int i = 0; i < h*w; i++)    cin >> mat[i/w][i%w];
        int ans = 0;
        for(int i = 0; i < h; i++){
            for(int j = 0; j < w; j++){
                if(mat[i][j] == '0')    continue;
                ans++;
                mat[i][j] = '0';
                queue<pair<int,int>> q;
                q.push({i,j});
                while(!q.empty()){
                    auto p = q.front(); q.pop();
                    int x = p.first, y = p.second;
                    for(int k = 0; k < 8; k++){
                        int nx = x+di[k], ny = y+dj[k];
                        if(inRange(nx,0,h)&&inRange(ny,0,w)&&mat[nx][ny]=='1'){
                            mat[nx][ny] = '0';
                            q.push({nx,ny});
                        }
                    }
                }
            }
        }
        cout << ans << endl;
    }
    return 0;
}

C++: #include<iostream>
#include<cstdio>

#define W 50
#define H 50

using namespace std;
void dfs(int w, int h);
int map[H][W];
int dy[8] = {1,1,0,-1,-1,-1,0,1}, dx[8] = {0,-1,-1,-1,0,1,1,1};
int w,h;

int main(){
  int i = 0,j = 0,is=0;
  cin >> w >> h;

  while(w != 0 && h != 0){
    for(i = 0;i < h;i++){
      for(j = 0;j<w;j++){
	cin>>map[i][j];
      }
    }
    i = j = 0;
    is = 0;
    while(i <= h-1  && j <= w-1){
      if(map[i][j] == 1){
	dfs(i,j);
	cout << "dfs end" << endl;
	is++;
      }
      i++;
      if(i == h){
	i = 0;
	j++;
      }
    }
    cout <<"the number of island is " << is << endl;
    cin >> w >> h;
  }
  return 0;
}

void dfs(int x,int y){
  cout << "x is " << x << " y is " << y <<endl;
  int i = 0;
  map[x][y] = 0;
  for(i = 0;i < 8; i++){
    if(x + dx[i] > -1 && y + dy[i] > -1 && x + dx[i] < h && y + dy[i] < w){
      if(map[x + dx[i]][y + dy[i]] == 1){
	dfs(x + dx[i],y + dy[i]);
      }
    }
  }
}

C++: #include<iostream>
#include<cstdio>
#include<algorithm>
#include<cmath>
#include<string>
#include<vector>
#include<list>
#include<set>
#include<map>
#include<queue>
#include<stack>
#include<cctype>
#include<climits>
#include<bitset>
#define ld long double
#define ll long long int
#define ull unsigned long long int
#define rep(i,n) for(i=0;i<n;i++)
#define fin(ans) cout<<(ans)<<endl
#define INF INT_MAX
#define vi vector<int>
#define vc vector<char>
#define vs vector<string>
#define vpii vector<pair<int,int> >
#define vvi vector<vector<int> >
#define vvc vector<vector<char> >
#define vvs vector<vector<string> >
#define P 1000000007
using namespace std;
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;}
const long long LLINF=1LL<<60;
//set<int>::iterator it;
//|\_
//g++ -std=c++1z temp.cpp
//./a.out

vvi v(50,vi(50,-2));

bool dfs(int x,int y,int count,int h,int w){
    
    if(v[y][x]>=0)return false;
    v[y][x]=count;
    bool t=true;
    if(x+1<w&&v[y][x+1]==-1){
        t=dfs(x+1,y,count,h,w);
    }
    if(x-1>=0&&v[y][x-1]==-1){
        t=dfs(x-1,y,count,h,w);
    }
    if(y+1<h&&v[y+1][x]==-1){
        t=dfs(x,y+1,count,h,w);
    }
    if(y-1>=0&&v[y-1][x]==-1){
        t=dfs(x,y-1,count,h,w);
    }///////
    if(x+1<w&&y+1<h&&v[y+1][x+1]==-1){
        t=dfs(x+1,y+1,count,h,w);
    }
    if(x-1>=0&&y-1>=0&&v[y-1][x-1]==-1){
        t=dfs(x-1,y-1,count,h,w);
    }
    if(y+1<h&&x-1>=0&&v[y+1][x-1]==-1){
        t=dfs(x-1,y+1,count,h,w);
    }
    if(y-1>=0&&x+1<w&&v[y-1][x+1]==-1){
        t=dfs(x+1,y-1,count,h,w);
    }
    if(t) return true;
    else return false;
}

int main(void){ios::sync_with_stdio(false);cin.tie(0);
//////////////////////////////////////////////////////
    int w,h,i,j;
    while(1){
        cin>>w>>h;
        if(w==0&&h==0)break;
        int count=1,x,y;
        rep(i,50)rep(j,50)v[i][j]=-2;
        rep(i,h)rep(j,w){
            cin>>v[i][j];
            v[i][j]*=-1;
        }
        bool c;
        for(y=0;y<h;y++){
            for(x=0;x<w;x++){
                c=dfs(x,y,count,h,w);
                if(c)count++;
            }
        }
        set<int> s;
        for(y=0;y<h;y++){
            for(x=0;x<w;x++){
                if(v[y][x]>0)s.insert(v[y][x]);
            }
        }
        cout<<s.size()<<endl;
        /*
        for(y=0;y<h;y++){
            for(x=0;x<w;x++){
                cout<<v[y][x]<<" ";
            }
            cout<<endl;
        }*/
    }
    

//////////////////////////////////////////////////////
return 0;}