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)
		}
	}
}

// -----------------------------------------------------------------------------

Python: import sys, re
from collections import deque, defaultdict, Counter
from math import ceil, sqrt, hypot, factorial, pi, sin, cos, radians, gcd
from itertools import accumulate, permutations, combinations, product, groupby, combinations_with_replacement
from operator import itemgetter, mul
from copy import deepcopy
from string import ascii_lowercase, ascii_uppercase, digits
from bisect import bisect, bisect_left
from heapq import heappush, heappop
from functools import reduce
def input(): return sys.stdin.readline().strip()
def INT(): return int(input())
def MAP(): return map(int, input().split())
def LIST(): return list(map(int, input().split()))
def ZIP(n): return zip(*(MAP() for _ in range(n)))
sys.setrecursionlimit(10 ** 9)
INF = float('inf')
mod = 10 ** 9 + 7


while 1:
	w, h = MAP()
	if w == 0 and h == 0:
		exit()

	c = [LIST() for _ in range(h)]

	cnt = 0
	check = [[0]*w for _ in range(h)]

	dy = (1, 1, 0, -1, -1, -1, 0, 1)
	dx = (0, -1, -1, -1, 0, 1, 1, 1)

	for y in range(h):
		for x in range(w):
			if check[y][x] == 0 and c[y][x] == 1:
				cnt += 1
				check[y][x] = cnt
				q = deque([(y, x)])
				while q:
					ny, nx = q.popleft()
					for k in range(8):
						ky = ny + dy[k]
						kx = nx + dx[k]
						if 0 <= ky < h and 0 <= kx < w and check[ky][kx] == 0 and c[ky][kx] == 1:
							check[ky][kx] = cnt
							q.append((ky, kx))

	print(cnt)

Python: import sys, math
from itertools import permutations, combinations
from collections import defaultdict, Counter, deque
from math import factorial#, gcd
from bisect import bisect_left #bisect_left(list, value)
sys.setrecursionlimit(10**7)
enu = enumerate
MOD = 10**9+7
def input(): return sys.stdin.readline()[:-1]
def pri(x): print('\n'.join(map(str, x)))


def dfs(i, j, c):
#    print('dfs:')
#    pri(c)
    if i<0 or j<0 or i>=len(c) or j>=len(c[0]) or c[i][j]==0:
        return
    c[i][j] = 0

    for di in [-1, 0, 1]:
        for dj in [-1, 0, 1]:
            dfs(i+di, j+dj, c)
    
    return

def solve(w, h, c):
    cnt = 0
    for i in range(h):
        for j in range(w):
            if c[i][j] == 1:
                cnt += 1
                dfs(i, j, c)
    print(cnt)
    return


while True:
    w, h = map(int, input().split())
    c = [list(map(int, input().split())) for _ in range(h)]
    if w == h == 0:
        break
    solve(w, h, c)

Python: import sys

def dfs(i, j):
    todo.append([i, j])
    while(todo != []):
        v = todo.pop(len(todo)-1)
        seen[v[0]][v[1]] = 1
        for i in range(8):
            if m[v[0]+dx[i]][v[1]+dy[i]] == 1 and seen[v[0]+dx[i]][v[1]+dy[i]] == 0:
                todo.append([v[0]+dx[i], v[1]+dy[i]])

while(1):
    w, h = map(int, input().split())
    if not w+h:
        break
    m = [[0] * (w+2) for i in range(h+2)]
    for j in range(h):
        m[j+1][1:w+1] = [int(i) for i in input().split()]

    dx = [0, 0, -1, 1, 1, 1, -1, -1]
    dy = [-1, 1, 0, 0, 1, -1, 1, -1]

    seen = [[0] * (w+2) for i in range(h+2)]
    todo = []
    ans = 0

    for i in range(h+2):
        for j in range(w+2):
            if m[i][j] == 1 and seen[i][j] == 0:
                ans += 1
                dfs(i, j)

    print(ans)

Python: #!python
# -*- coding: utf-8 -*-

import sys

sys.setswitchinterval(10**9)


next_s = ((-1, 1), (0, 1), (1, 1),
          (-1, 0), (1, 0),
          (-1, -1), (0, -1), (1, -1))


def DFS(x, y):
    if not (0 <= x < W and 0 <= y < H):
        return
    if map_[y][x] == 0:
        return

    map_[y][x] = 0

    for dx, dy in next_s:
        DFS(x + dx, y + dy)


while True:
    W, H = map(int, input().split())
    if W == 0 and H == 0:
        break
    map_ = [list(map(int, input().split())) for h in range(H)]
    island_num = 0
    for x in range(W):
        for y in range(H):
            if map_[y][x] == 1:
                DFS(x, y)
                island_num += 1
    print(island_num)

Python: def dfs(w,h,W,H,ID,islands,islandsID):
    if islands[h][w]==1 and islandsID[h][w]!=0:
        for i in range(-1,2):
            for j in range(-1,2):
                dw=w+i
                dh=h+j
                if dw>=0 and dw<W and dh>=0 and dh<H:
                    if islands[dh][dw]==1:
                        islandsID[dh][dw]=islandsID[h][w]
    if islands[h][w]==1 and islandsID[h][w]==0:
        for i in range(-1,2):
            for j in range(-1,2):
                dw=w+i
                dh=h+j
                if dw>=0 and dw<W and dh>=0 and dh<H:
                    if islands[dh][dw]==1:
                        islandsID[dh][dw]=ID
        ID+=1
    return ID

while True:
    islands=[]
    islandsID=[]
    ID=1
    W,H=map(int,input().split())
    if W==0:
        break
    for i in range(H):
        islandsID.append([0 for j in range(W)])
    for _ in range(H):
        islands.append(list(map(int,input().split())))
    for h in range(H):
        for w in range(W):
            ID=dfs(w,h,W,H,ID,islands,islandsID)
    print(ID-1)