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 <cstdio>
#include <cstring>
using namespace std;

int n,m,a[50][50],b[50][50],ans;
bool inRange(int z,int l,int r){
	return z>=l&&z<r;
}
void fill(int x,int y){
	if(!a[x][y]||b[x][y])return;
	b[x][y]=true;
	for(int xx=-1;xx<=1;xx++)if(inRange(x+xx,0,n)){
		for(int yy=-1;yy<=1;yy++)if(inRange(y+yy,0,m)){
			fill(x+xx,y+yy);
		}
	}
}
int main(){
	while(scanf("%d%d",&m,&n),n*m){
		ans=0;
		memset(b,0,sizeof(int)*2500);
		for(int i=0;i<n;i++)
			for(int j=0;j<m;j++)
				scanf("%d",&a[i][j]);
		for(int i=0;i<n;i++)
			for(int j=0;j<m;j++)
				if(!b[i][j]&&a[i][j])
					ans++,fill(i,j);
		printf("%d\n",ans);
	}

	return 0;
}

C++: #include <iostream>
using namespace std;
 
void f(int n){
if(n%100==0){
cerr<<n<<endl;
}
f(n+1);
}
 
int main(){
f(1);
}

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

using namespace std;

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

typedef struct Point{
    int x;
    int y;
}Point;

bool solve(Point p, int *a){
    
    int res = *a;
    if(c[p.y][p.x] == 1){
        res++;
        c[p.y][p.x] = 0;
        for(int i=-1; i<2; i++){
            for(int j=-1; j<2; j++){
                if(!(i==0 && j==0)){
                    if(0<=p.y+i && p.y+i <h && 0<=p.x+j && p.x+j <w){
                        if(c[p.y+i][p.x+j] == 1){
                        solve(Point{p.x+j,p.y+i}, &res);
                        }
                    }
                }
            }
        }
    }
    
    if(res>0)
    return true;
    
    return false;
}

int main(int argc, const char * argv[]) {
    // insert code here...
    /////////
    //write//
    /////////
    
    while(1){
        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 a = 0;
        int cnt = 0;
        for(int i=0; i<h; i++){
            for(int j=0; j<w; j++){
                if(solve(Point{j,i}, &a)){
                    //cout << "x:" << j << ",y:" << i << endl;
                    cnt++;
                }
            }
        }
        
        cout << cnt << endl;
    }
    
    return 0;
}

C++: #include<bits/stdc++.h>
#define rep(i,n) for(int i = 0;i<n;i++)
using namespace std;
typedef pair<int,int> P;
typedef long long ll;
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 c[55][55];

void dfs(int x,int y) {
    for(int dx = -1;dx<=1;dx++) {
        for(int dy = -1;dy<=1;dy++) {
            int nx = x + dx;
            int ny = y + dy;
            if(nx<0 || nx>=h || ny<0 || ny>=w) continue;
            if(c[nx][ny] == 0) continue;
            if(c[nx][ny] == 1) c[nx][ny] = 0;
            dfs(nx,ny);
        }
    }
}

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

C++: #include <bits/stdc++.h>
using namespace std;
#define rep(i,n) for(int i=0;i<n;++i)
vector<vector<int>> C(50,vector<int>(50));
int cnt=0,w,h;

void dfs(int x,int y){
    C.at(x).at(y) = 0;
    for(int i=-1;i<2;++i){
        for(int j=-1;j<2;++j){
            int nh = x + i;
            int nw = y + j;
            if(0<=nw&&nw<w&&0<=nh&&nh<h&&C.at(nh).at(nw)==1){
            dfs(nh,nw);
            }
        }
        
    }
}

int main(){
    while(true){
        cin >> w >> h;
        if(w==0&&h==0){
            return 0;
        }
        rep(i,50){
            rep(j,50){
                C.at(i).at(j) = 0;
            }
        }
        cnt = 0;
        rep(i,h){
            rep(j,w){
                cin >> C.at(i).at(j);
            }
        }
       rep(i,h){
            rep(j,w){
                if(C.at(i).at(j)==1){
                    dfs(i,j);
                    ++cnt;
                }   
            }
        }
        cout << cnt << endl;    
    }
}

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

#define FOR(i,a,b) for(int i=(a);i<(int)(b);i++)
#define rep(i,n) FOR(i,0,n)
#define ZERO(a) memset(a,0,sizeof(a))

const int M = 55;
int w,h;
int f[M][M];
int dx[] = {1,1,1,0,0,-1,-1,-1};
int dy[] = {0,1,-1,1,-1,0,1,-1};

void dfs(int x, int y) {
    if(x == w || y == h) return ;
    f[y][x] = 0;
    rep(i,8) {
        int nx = x+dx[i], ny = y+dy[i];
        if(f[ny][nx] == 1)
            dfs(nx, ny);
    }
}

int main() {
    while(cin>>w>>h && w) {
        ZERO(f);
        rep(i,h) rep(j,w) cin >> f[i][j];

        int ans = 0;
        rep(i,h) rep(j,w) {
            if(f[i][j] == 0) continue;
            dfs(j,i);
            ans++;
        }

        cout << ans << endl;
    }

    return 0;
}