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 <bits/stdc++.h>
using namespace std;

using ll=long long;
#define int ll

#define FOR(i,a,b) for(int i=int(a);i<int(b);i++)
#define REP(i,b) FOR(i,0,b)

int read(){
	int i;
	scanf("%lld",&i);
	return i;
}

int land[100][100]={-1};
int dy[]={-1,-1,-1,0,0,1,1,1};
int dx[]={-1,0,1,-1,1,-1,0,1};
int cnt=0;

void isLand(int i,int j){
	land[i][j] = 0;
	REP(k,8){
		int newx=i+dx[k];
		int newy=j+dy[k];
		if(land[newx][newy]==1)isLand(newx,newy);
	}
}

signed main(){
	int w,h;
	while( w=read(),h=read(),w||h){
		cnt=0;
		
		REP(i,100){
			REP(j,100){
				land[i][j]=0;
			}
		}
		FOR(i,1,w+1){
			FOR(j,1,h+1){
				land[i][j]=read();
			}
		}
		
		FOR(i,1,w+1){
			FOR(j,1,h+1){
				if(land[i][j]==1){
					cnt++;
					isLand(i,j);
				}
			}
		}
		
		cout << cnt << endl;
	}
	
}

C++: #include <cstdio>
#include <cctype>
#include <utility>
#include <vector>
using namespace std;

#define gcu getchar_unlocked
#define ii inline int in
ii(int c) {
	int n = 0;
	bool minus = false; if (c == '-') minus = true, c = gcu();
	do {n = 10 * n + (c - '0'), c = gcu();} while (c >= '0');
	//return n; }
	return minus ? -n : n; }
ii() {return in(gcu());}
inline bool scan(int &n) {int c=gcu();return c==EOF?false:(n=in(c),true);}
//void scan(string &s) {for (char c; !isspace(c = gcu()); s += c);}
#undef ii
#define pcu putchar_unlocked
template <typename T>
void out(T n) {
	static char buf[20];
	char *p = buf;
	if(n < 0) pcu('-'), n *= -1;
	if (!n) *p++ = '0';
	else while (n) *p++ = n % 10 + '0', n /= 10;
	while (p != buf) pcu(*--p); }
void out(const char *s){while(*s)pcu(*s++);}
void out(char c){pcu(c);}
//void out(string &s){for (char c: s) pcu(c);}
template <typename head, typename... tail>
void out(head&& h, tail&&... t){out(h);out(move(t)...);}
template <typename T>
//void out(vector<T> &v){for(T &x:v)out(' '),out(x);out('\n');}
void out(vector<T> &v){for(T &x:v)out(&x == &v[0]?"":" "),out(x);out('\n');}
#undef svo

typedef vector<vector<int>> map;

bool walk(int x, int y, map &m) {
	static const int
		dx[] = {1, 1, 0, -1, -1, -1, 0, 1},
		dy[] = {0, 1, 1, 1, 0, -1, -1, -1};
	if (x < 0 || x >= (int) m[0].size() ||
		y < 0 || y >= (int) m.size() ||
		m[y][x] == 0)
		return false;
	m[y][x] = 0;
	int i = 0;
	for (; i < 8; i++)
		walk(x + dx[i], y + dy[i], m);
	return true;
}

int main() {
	int W, H;
	while(scan(W) && scan(H) && (W || H)) {
		map m(H, vector<int>(W));
		for (auto &v: m)
			for (int &i :v)
				i = in();
		int c = 0;
		for (int i = 0; i < H; i++)
			for (int j = 0; j < W; j++)
				if (walk(j, i, m))
					c++;
		//for (auto v : m)
		//	out(v);
		//out('\n');
		out(c, '\n');
	}
}

C++: #include <iostream>
#include <iomanip>
#include <sstream>
#include <stdio.h>
#include <list>
#include <vector>
#include <stack>
#include <queue>
#include <algorithm>
#include <math.h>
#include <utility>
#include <string>
#include <ctype.h>
#include <cstring>
#include <cstdio>
#include <sstream>
#include <functional>

using namespace std;

#define FOR(i,k,n) for(int i = (k); i < (n); i++)
#define REP(i,n) FOR(i,0,n)
#define INF 114514810
#define ll long long
//#define scanf scanf_s

int w, h;
int isl[55][55];

int di[8] = { -1, -1, -1, 0, 0, 1, 1, 1 }; int dj[8] = { -1, 0, 1, -1, 1, -1, 0, 1 };

void dfs(int i, int j)
{
	if (isl[i][j] == 1)
	{
		isl[i][j] = 0;
		REP(k, 8) dfs(i + di[k], j + dj[k]);
	}
}

int main()
{
	while (cin >> w >> h, w)
	{
		REP(i, h)REP(j, w) cin >> isl[i][j];
		int cnt = 0;
		REP(i, h)REP(j, w)
		{
			if (isl[i][j] == 1)
			{
				cnt++;
				dfs(i, j);
			}
		}
		cout << cnt << endl;
	}
	return 0;
}

C++: // AOJ1160
#include <bits/stdc++.h>
#define endl "\n"
#define rep(i,n) for(int i=0;i<int(n);i++)
#define SZ(x) ((int)(x).size())
#define all(x) (x).begin(),(x).end()
using namespace std;
typedef long long ll;
typedef long double ld;
typedef pair<int, int> ipair;
template <class T>ostream &operator<<(ostream &o,const vector<T>&v)
{o<<"{";for(int i=0;i<(int)v.size();i++)o<<(i>0?", ":"")<<v[i];o<<"}";return o;}
namespace you {
    std::string to_string(char val) {
        return std::string(1, val);
        // return std::string{val};
        // you::to_string(char)
    }
}
int w,h;
vector<vector<int>> ma(60,vector<int>(60));
int ans;
void dfs(int y,int x){
    if(y<0||h<=y||x<0||w<=x) return;
    if(ma[y][x]==0) return;
    ma[y][x]=0; //陸を海にしちゃう
    for(int i=-1;i<=1;i++){
        for(int j=-1;j<=1;j++){
            dfs(y+i,x+j);
        }
    }
}
int main() {
    cin.tie(0);
    ios::sync_with_stdio(false);
    cout << fixed << setprecision(12);

    while(cin>>w>>h){
        ans=0;
        if(w==0 && h==0) break;
        rep(y,h){
            rep(x,w){
                cin>>ma[y][x];
            }
        }
        rep(y,h){
            rep(x,w){
                if(ma[y][x]==0) continue;
                dfs(y,x);
                ans++;
            }
        }
        cout<<ans<<endl;
    }
    return 0;
}