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>
#include <string>
#include <vector>
#include <queue>
#include <map>
#include <cmath>
#include <set>
#include <algorithm>

typedef long long ll;
const ll MOD = 1e9 + 7;
const long long INF = 1LL<<60;
const double PI=3.14159265358979323846;
const int NMAX=100005;
using namespace std;

int done[51][51];
int c[51][51];

void dfs(int i, int j, int w, int h){
    if(i < 0 || i >= h || j < 0 || j >= w) return;
    if(done[i][j] != 0) return;

    done[i][j] = 1;
    
    if(c[i][j] == 1){
        dfs(i-1,j-1,w,h);
        dfs(i-1,j,w,h);
        dfs(i-1,j+1,w,h);
        dfs(i,j-1,w,h);
        dfs(i,j+1,w,h);
        dfs(i+1,j-1,w,h);
        dfs(i+1,j,w,h);
        dfs(i+1,j+1,w,h);
    }
}

void solve(int w, int h){
    for(int i = 0; i < h; i++){
        for(int j = 0; j < w; j++){
            cin >> c[i][j];
            done[i][j] = 0;
        }
    }
    int ans = 0;
    for(int i = 0; i < h; i++){
        for(int j = 0; j < w; j++){
            if(done[i][j] == 0 && c[i][j] == 1){
                ans += 1;
                dfs(i,j,w,h);
            }
        }
    }
    cout << ans << endl;
}

int main(){
    while(true){
        int w,h;
        cin >> w >> h;
        if(w == 0 && h == 0) break;
        solve(w,h);
    }

    return 0;
}

C++: #include <iostream>
#include <vector>
#include <string>
#include <cmath>
#include <algorithm>

using namespace std;

int c[52][52];

void er(int i,int j){
    c[i][j]--;
    if(c[i+1][j-1])
        er(i+1,j-1);
    if(c[i][j+1])
        er(i,j+1);
    if(c[i+1][j])
        er(i+1,j);
    if(c[i+1][j+1])
        er(i+1,j+1);
    if(c[i-1][j+1])
        er(i-1,j+1);
    if(c[i-1][j])
        er(i-1,j);
    if(c[i-1][j-1])
        er(i-1,j-1);
    if(c[i][j-1])
        er(i,j-1);
}

int main(void){
    int w,h;
    int i,j;
    int a;
    while(true){
        cin >> w >> h;
        if(w == 0){
            break;
        }
        for(i = 0;i < 52;i++){
            for(j = 0;j < 52;j++){
                c[i][j] = 0;
            }
        }
        for(i = 1;i <= w;i++){
            for(j = 1;j <= h;j++){
                cin >> c[i][j];
            }
        }
        a = 0;
        for(i = 1;i <= w;i++){
            for(j = 1;j <= h;j++){
                if(c[i][j]){
                    er(i,j);
                    a++;
                }
            }
        }
        cout << a << endl;
    }
}

C++: #include<iostream>
using namespace std;
int w,h;
int masu[1010][1010];
int dx[] = {-1,-1,-1,0,0,1,1,1};
int dy[] = {-1,0,1,-1,1,-1,0,1};
void dfs(int y,int x){
    masu[y][x] = 0;
    for(int i=0;i<8;i++){
        int ny = y+dy[i];
        int nx = x+dx[i];
        if(ny<0||ny>=h||nx<0||nx>=w||masu[ny][nx]==0) continue;
        dfs(ny,nx);
    }
}
int main(){
    int ans;
    while(cin >> w >> h,w!=0||h!=0){
        for(int i=0;i<h;i++){
            for(int j=0;j<w;j++) cin >> masu[i][j];
        }
        ans = 0;
        for(int i=0;i<h;i++){
            for(int j=0;j<w;j++){
                if(masu[i][j] == 1){
                    ans++;
                    dfs(i,j);
                }
            }
        }
        cout << ans << endl;
    }
    return(0);
}

C++: #define _GLIBCXX_DEBUG
#include <bits/stdc++.h>
using namespace std;
using ll = long long;
const int dx[8] = {1, 1, 0, -1, -1, -1, 0, 1}, dy[8] = {0, 1, 1, 1, 0, -1, -1, -1};
ll seen[55][55];
ll W, H;
void dfs(int h, int w) {
    seen[h][w] = 0;
    
    for (ll dir = 0; dir < 8; dir++) {
        ll nh = h + dx[dir];
        ll nw = w + dy[dir];
        if (nh < 0 || nh >= H || nw < 0 || nw >= W) continue;
        if (seen[nh][nw] == 0) continue;
        
        
        dfs(nh, nw);
            
    }
}


int main(){
    while(1 > 0){
        ll ans = 0;
        cin >> W >> H;
        if(W == 0 && H == 0) break;

        for (ll i = 0; i < H; i++) {
            for (ll j = 0; j < W; j++) {
                cin >> seen[i][j];
            }
        }

        for (ll i = 0; i < H; i++) {
            for (ll j = 0; j < W; j++) {
                if(seen[i][j]){
                    dfs(i,j);
                    ans++ ;
                }
            }
        }
        printf("%lld\n", ans);
    }

    return 0;
}