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<stdio.h>
#include<iostream>
#include<string>
using namespace std;

int main(){

	
	int w,h;
	while(1){
		cin>>w>>h;if(w==0&&h==0)break;
		int n[51][51]={};
	bool N[51][51]={};
		for(int i=0;i<h;i++)
			for(int j=0;j<w;j++)
			{int x;cin>>x;if(x==1)N[i][j]=true;}

		int c=0;
		for(int i=0;i<h;i++)
			for(int j=0;j<w;j++)
			{if(N[i][j]==true&&n[i][j]==0){
				c++;
				n[i][j]=c;
				if(n[i-1][j+1]==0)n[i-1][j+1]=c;
				if(n[i-1][j]==0)n[i-1][j]=c;
				if(n[i-1][j-1]==0)n[i-1][j-1]=c;
				if(n[i][j+1]==0)n[i][j+1]=c;
				if(n[i-1][j]==0)n[i-1][j]=c;
				if(n[i+1][j+1]==0)n[i+1][j+1]=c;
				if(n[i+1][j]==0)n[i+1][j]=c;
				if(n[i+1][j-1]==0)n[i+1][j-1]=c;
			}
			else if(N[i][j]==true&&n[i][j]>0){
				int y=n[i][j];
				n[i-1][j+1]=y;
				n[i-1][j]=y;
				n[i-1][j-1]=y;
				n[i][j+1]=y;
				n[i-1][j]=y;
				n[i+1][j+1]=y;
				n[i+1][j]=y;
				n[i+1][j-1]=y;
			}
			}

			for(int i=0;i<h;i++){
			for(int j=0;j<w;j++){
				int t=n[i][j];
				if(N[i][j]==true&&N[i][j+1]==true&&t>n[i][j+1])t=n[i][j+1];
				if(N[i][j]==true&&N[i][j-1]==true&&t>n[i][j-1])t=n[i][j-1];
				if(N[i][j]==true&&N[i+1][j+1]==true&&t>n[i+1][j+1])t=n[i+1][j+1];
				if(N[i][j]==true&&N[i+1][j]==true&&t>n[i+1][j])t=n[i+1][j];
				if(N[i][j]==true&&N[i+1][j-1]==true&&t>n[i+1][j-1])t=n[i+1][j-1];
				if(N[i][j]==true&&N[i-1][j+1]==true&&t>n[i-1][j+1])t=n[i-1][j+1];
				if(N[i][j]==true&&N[i-1][j]==true&&t>n[i-1][j])t=n[i-1][j];
				if(N[i][j]==true&&N[i-1][j-1]==true&&t>n[i-1][j-1])t=n[i-1][j-1];
				if(n[i][j]>t){
					for(int ii=0;ii<h;ii++)
			for(int jj=0;jj<w;jj++){
				if(n[i][j]==n[ii][jj])n[ii][jj]=t;
			}
				}
			}
			}

			int max=0;
			for(int i=0;i<h;i++){
			for(int j=0;j<w;j++){
				if(N[i][j]==true&&n[i][j]>max)max=n[i][j];
			}}
			cout<<max<<endl;
			}
return 0;
}

C++: #include <iostream>
#include <queue>
#include <stdio.h>

using namespace std;

#define NUM 50

int w, h;
int c[NUM][NUM];
bool visited[NUM][NUM];
queue<pair<int, int> > Q;

void init(){
    for(int i = 0; i < h; i++){
        for(int j = 0; j < w; j++){
            visited[i][j] = false;
        }
    }
}

bool can_visit(int i, int j){
    if(i < 0 || h <= i || j < 0 || w <= j){
        return false;
    }
    if(visited[i][j] || c[i][j] == 0){
        return false;
    }
    return true;
}

pair<int, int> find_new_place(){
    for(int i = 0; i < h; i++){
        for(int j = 0; j < w; j++){
            if(can_visit(i, j)){
                return make_pair(i, j);
            }
        }
    }

    return make_pair(-1, -1);
}

bool exec(void){
    scanf("%d %d", &w, &h);
    if(w == 0 && h == 0){
        return false;
    }

    init();

    for(int i = 0; i < h; i++){
        for(int j = 0; j < w; j++){
            scanf("%d", &c[i][j]);
        }
    }

    int count = 0;

    while(true){
        pair<int, int> new_place = find_new_place();
        if(new_place.first == -1){
            break;
        }

        count++;

        Q.push(new_place);
        visited[new_place.first][new_place.second] = true;
        while(!Q.empty()){
            pair<int, int> p = Q.front(); Q.pop();
            int x = p.first;
            int y = p.second;

            vector<pair<int, int> > v;
            v.push_back(make_pair(x, y + 1));
            v.push_back(make_pair(x, y - 1));
            v.push_back(make_pair(x + 1, y + 1));
            v.push_back(make_pair(x + 1, y));
            v.push_back(make_pair(x + 1, y - 1));
            v.push_back(make_pair(x - 1, y + 1));
            v.push_back(make_pair(x - 1, y));
            v.push_back(make_pair(x - 1, y - 1));

            for(auto&& item : v){
                int x_ = item.first;
                int y_ = item.second;
                if(can_visit(x_, y_)){
                    visited[x_][y_] = true;
                    Q.push(make_pair(x_, y_));
                }
            }
        }
    }

    printf("%d\n", count);

    return true;
}

int main(void){
    while(exec()){
        ;
    }
    
    return 0;
}

C++: #include <stdio.h>

	int sima[50][50];
	int cnt=0;
	int cflag=0;

int count_sima(int w,int h){
	if(w<0)return 0;
	if(h<0)return 0;
	if(sima[w][h]==3)return 0;
	if(sima[w][h]==0)return 0;

		if(cflag==0){
			cnt++;
			cflag=1;
		}
		

		sima[w][h]=0;

		count_sima(w,h+1);
		count_sima(w+1,h+1);
		count_sima(w+1,h);
		count_sima(w+1,h-1);
		count_sima(w,h-1);
		count_sima(w-1,h-1);
		count_sima(w-1,h);
		count_sima(w-1,h+1);


	return 0;
}


int main(void){
	int w2,h2; //島の大きさを格納する
	int p;

	scanf("%d %d",&w2,&h2);
	while(w2!=0 && h2!=0){

		//島配列をすべてを3にする
		for(int i=0; i<50; i++){
			for(int j=0; j<50; j++){
				sima[i][j]=3;
			}
		}

		//入力された地図のデータを設定
		for(int i=0; i<h2; i++){
			for(int j=0; j<w2; j++){
				scanf("%d",&p);
				sima[i][j]=p;
			}
		}

		//ここまで入力された地図のデータを設定

		for(int i=0; i<h2; i++){
			for(int j=0; j<w2; j++){
				count_sima(i,j);
				cflag=0;
			}
		}

		printf("%d\n",cnt);
		cnt=0;

		scanf("%d %d",&w2,&h2);
	}

	return 0;
}