Go: package main

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

const (
	initialBufSize = 100000
	maxBufSize     = 1000000
)

var sc *bufio.Scanner

func initScanner(r io.Reader) *bufio.Scanner {
	buf := make([]byte, initialBufSize)

	sc := bufio.NewScanner(r)
	sc.Buffer(buf, maxBufSize)
	sc.Split(bufio.ScanWords) // bufio.ScanLines
	return sc
}

func main() {
	sc = initScanner(os.Stdin)
	resolve()
}

func resolve() {
	results := []int{}
	for true {
		w, h := scanInt(sc), scanInt(sc)
		if w == 0 && h == 0 {
			break
		}
		grid := make([][]int, h)
		for i := 0; i < h; i++ {
			grid[i] = make([]int, w)
			for j := 0; j < w; j++ {
				grid[i][j] = scanInt(sc)
			}
		}
		num := 0
		for i := range loop0(h) {
			for j := range loop0(w) {
				start := pos{y: i, x: j}
				if grid[start.y][start.x] == 0 {
					continue
				}
				num++
				_dfs(grid, w, h, start)
			}
		}
		results = append(results, num)
	}
	for _, v := range results {
		fmt.Println(v)
	}
	return
}

func _dfs(grid [][]int, w, h int, start pos) {
	grid[start.y][start.x] = 0
	for _, df := range []pos{
		pos{1, 0}, pos{-1, 0},
		pos{0, -1}, pos{0, 1},
		pos{1, 1}, pos{-1, -1},
		pos{-1, 1}, pos{1, -1},
	} {
		np := addPos(start, df)
		if np.y < 0 || h <= np.y || np.x < 0 || w <= np.x {
			continue
		}
		if grid[np.y][np.x] == 0 {
			continue
		}
		_dfs(grid, w, h, np)
	}
}

type pos struct{ x, y int }

func addPos(p, d pos) pos {
	return pos{
		x: p.x + d.x,
		y: p.y + d.y,
	}
}

func loop0(n int) chan int {
	return loop(0, n-1, 1)
}

func loop1(n int) chan int {
	return loop(1, n, 1)
}

func loop(s, e, d int) chan int {
	ch := make(chan int)
	go func() {
		for i := s; i <= e; i += d {
			ch <- i
		}
		close(ch)
	}()
	return ch
}

// snip-scan-funcs
func scanInt(sc *bufio.Scanner) int {
	sc.Scan()
	i, _ := strconv.Atoi(sc.Text())
	return int(i)
}
func scanString(sc *bufio.Scanner) string {
	sc.Scan()
	return sc.Text()
}

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

vector<vector<bool>> seen;
int H, W;
int d_h[8] = {1,1,1,0,0,-1,-1,-1};
int d_w[8] = {1,0,-1,1,-1,1,0,-1};

void dfs(const vector<vector<int>> &m, int h, int w){
    seen[h][w] = true;

    //cout << h << ' ' << w <<  ' ' << m[h][w] << endl;
    
    for(int i = 0; i < 8; i++){
        if(1 <= h+d_h[i] && h+d_h[i] <= H && 1 <= w+d_w[i] && w+d_w[i] <= W && (!seen[h+d_h[i]][w+d_w[i]]) && m[h+d_h[i]][w+d_w[i]] == 1){
            dfs(m, h+d_h[i], w+d_w[i]);
        }
    }
}

int main(){
    while(1){
        cin >> W >> H;
        seen.assign(H+1, vector<bool>(W+1, false));
        if(H == 0 && W == 0) break;
        vector<vector<int>> m(H+1, vector<int>(W+1,0));
        for(int i = 1; i <= H; i++){
            for(int j = 1; j <= W; j++){
                cin >> m[i][j];
            }
        }

        int cnt = 0;
        for(int i = 1; i <= H; i++){
            for(int j = 1; j <= W; j++){
                if(!seen[i][j] && m[i][j] == 1) {
                    //cout << i << ' ' << j << endl;
                    cnt++;
                    dfs(m, i, j);
                }
            }
        }
        cout << cnt << endl;
    }
}

C++: #include<bits/stdc++.h>
using namespace std;
typedef long long ll;
#define rep(i,n) for(int i=0;i<(n);i++)
#define rep2(i,n) for(int i=1;i<=(n);i++)
#define rep3(i,i0,n) for(int i=i0;i<(n);i++)
#define pb push_back
#define mod 1000000007
#define INF 200000000000
template<class T>bool chmax(T &a, const T &b) { if (a<b) { a=b; return 1; } return 0; }
template<class T>bool chmin(T &a, const T &b) { if (b<a) { a=b; return 1; } return 0; }
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;}
#define all(x) x.begin(), x.end()
#define mp make_pair
bool compare(pair<int, int> a, pair<int, int> b) {
    if(a.first != b.first){
        return a.first < b.first;
        
    }else{
        return a.second < b.second;
    }
}
// 入力

vector<vector<ll> > G;
vector<bool> seen;


//ll fcnt=1;
void dfs(ll v){
    seen[v] = 1;

    rep(i,G[v].size()){
        if(seen[G[v][i]] == 0){
            dfs(G[v][i]);
        }
    }

}

int main() {
    
    while(1){
        G.clear();
        seen.clear();
        ll w,h;
    
        cin >> w>>h;
        if(w==0 &&h==0) break;
        ll cnt=1;
        map<pair<ll,ll>,ll> m;
        
        rep(i,h){
            rep(j,w){
                bool c;
                cin >>c;
                if(c){
                    m[mp(i,j)] = cnt;
                    cnt++;
                }
            }
        }
        G.resize(cnt);
        seen.resize(cnt);


        rep(i,h){
            rep(j,w){
                if(m[mp(i,j)]){
                    if(m[mp(i-1,j-1)]){
                        G[m[mp(i,j)]].pb(m[mp(i-1,j-1)]);
                    }
                    if(m[mp(i,j-1)]){
                        G[m[mp(i,j)]].pb(m[mp(i,j-1)]);
                    }
                    if(m[mp(i-1,j)]){
                        G[m[mp(i,j)]].pb(m[mp(i-1,j)]);
                    }
                    if(m[mp(i,j+1)]){
                        G[m[mp(i,j)]].pb(m[mp(i,j+1)]);
                    }
                    if(m[mp(i+1,j)]){
                        G[m[mp(i,j)]].pb(m[mp(i+1,j)]);
                    }
                    if(m[mp(i+1,j-1)]){
                        G[m[mp(i,j)]].pb(m[mp(i+1,j-1)]);
                    }
                    if(m[mp(i-1,j+1)]){
                        G[m[mp(i,j)]].pb(m[mp(i-1,j+1)]);
                    }
                    if(m[mp(i+1,j+1)]){
                        G[m[mp(i,j)]].pb(m[mp(i+1,j+1)]);
                    }

                }
            }
        }
        /*rep(i,G.size()){
            rep(j,G[i].size()){
                cout << G[i][j];
            }
            cout << endl;
        }*/

        /*rep(i,h){
            rep(j,w){
                cout << m[mp(i,j)]<< " ";
            }
            cout << endl;
        }*/
        ll ans = 0;
        rep(i,h){
            rep(j,w){
                if(m[mp(i,j)]){
                    if(seen[m[mp(i,j)]] == 0){
                        dfs(m[mp(i,j)]);
                        ans++;
                    }
                }
            }
        }
        

        cout<<ans<<endl;
    }
    return 0;
    

}

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

#define rep(i, n) for(auto i=0; i != n; ++i)
#define REP(i, k, n) for(auto i=k; i != n; ++i)
#define rrep(i, n) for(auto i=n; i != 0; --i)
#define RREP(i, n, k) for(auto i=n; i != k; --i)


int sea[60][60];
int w,h;
void dfs(int x, int y){
    int dx[] = {0, 1, -1};
    int dy[] = {0, 1, -1};

    if(sea[x][y] == -1) return ;

    if(sea[x][y] == 1){
        sea[x][y] = -1;
    }

    for(int xx=-1; xx<=1; xx++){
        for(int yy=-1; yy<=1; yy++){
            if(xx==0 && yy==0){
                continue;
            }

            if(sea[x + xx][y + yy] == 1){
                dfs(x+xx, y+yy);

            }

        }
    }



}

int main (){
    while (true){
        cin>>w>>h;
        if(w==0 && h==0){ break;}
        rep(i, 60){
            rep(j,60){
                sea[i][j] = -1;
            }
        }

        rep(i, h){
            rep(j,w){
                cin>>sea[i+1][j+1];
            }
        }


        int ans = 0;
        rep(i, h){
            rep(j,w){
                if(sea[i+1][j+1] == 1){
                    dfs(i+1,j+1);
                    ans++;
                }
            }
        }

        cout<<ans<<endl;

    }

}