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
}

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)

Python: import sys
sys.setrecursionlimit(10 ** 9)

def search_island(h, w, max_h, max_w):
    for i in range(8):
        next_h = h + [1, 1, 0, -1, -1, -1, 0, 1][i]
        next_w = w + [0, 1, 1, 1, 0, -1, -1, -1][i]
        if not 0 <= next_h < max_h or not 0 <= next_w < max_w:
            continue
        elif step[next_h][next_w] or not field[next_h][next_w]:
            continue
        step[next_h][next_w] = True
        search_island(next_h, next_w, max_h, max_w)

while True:
    max_w, max_h = map(int, input().split())
    if max_w == max_h == 0:
        break
    field = [[int(i) for i in input().split()] for _ in range(max_h)]
    step = [[False for _ in range(max_w)] for _ in range(max_h)]
    island = 0
    for i in range(max_h):
        for j in range(max_w):
            if step[i][j] or not field[i][j]:
                continue
            search_island(i, j, max_h, max_w)
            island += 1
    print(island)

Python: import sys

sys.setrecursionlimit(1000000)


def rec(y, x, f):
    f[y][x] = '0'
    for dy, dx in [(-1, -1), (-1, 0), (-1, 1), (0, -1), (0, 1), (1, -1), (1, 0),
            (1, 1)]:
        if 0 <= y+dy < len(f) and 0 <= x+dx < len(f[0]) and f[y+dy][x+dx] == '1':
            rec(y+dy, x+dx, f)


def main():
    while True:
        w, h = [int(i) for i in input().split()]
        if w == 0 and h == 0:
            break
        field = []
        for i in range(h):
            field.append(input().split())
        ans = 0
        for i in range(h):
            for j in range(w):
                if field[i][j] == '1':
                    rec(i, j, field)
                    ans += 1
        print(ans)


if __name__ == '__main__':
    main()