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: h,w=1,1

count=0
anser=0

def search(x,y):
    #マップの外側か壁の場合は何もしない
    #print(x,y)

    global count
    count+=1
    if x<0 or x>w-1 or y<0 or y>h-1 or map_data[y][x]==0:
 
        return
        
    
    #以前に到達していたら何もしない
    if reached[y][x] ==0:
         return

    reached[y][x]=0
    
    #print("aa")



    search(x+1,y)#右
    search(x-1,y)#左
    search(x,y+1)#上
    search(x,y-1)#下
    search(x-1,y-1)
    search(x-1,y+1)
    search(x+1,y-1)
    search(x+1,y+1)



while h!=0 and w!=0: 
    anser=0
    count=1
    #グラフの入力方法------

    w,h=map(int ,raw_input().split())
    if h==0 and w==0:
        break

    map_data = [[0]*w for _ in range(h)]
    reached = [[1]*w for _ in range(h)]

    for i in range(h):
        ct = raw_input().split()
       
        for j in range(w):
            map_data[i][j] = int(ct[j])
            reached [i][j]=int(ct[j])
            if ct[j]==1:
                sx=j
                sy=i

    t=0
    a=0
    while a<=h:
       if 1 in reached[t%h]:         
            search(reached[t%h].index(1),t%h)
            anser+=1
            #print("count",count)
            count=1
            a=0
       elif count==h:
                break
       t+=1
       a+=1

    print(anser)

Python: import sys
import copy
sys.setrecursionlimit(10**7)
dx = [1,0,-1,0,1,1,-1,-1]
dy = [0,1,0,-1,1,-1,1,-1]
def dfs(MAP,w,h,x,y):
    MAP[y][x] = 0
    for dir in range(8):
        nx = x + dx[dir]
        ny = y + dy[dir]
        if nx < 0 or nx >= w or ny < 0 or ny >= h:
            continue
        if MAP[ny][nx] == 0:
            continue
        dfs(MAP,w,h,nx,ny)
ans = []
bool = True
while(bool):
    w,h = map(int,input().split())
    if w == 0 and h == 0:
        bool = False
        break
    c = [list(map(int,input().split())) for _ in range(h)]
    cnt = 0
    for i in range(h):
        for j in range(w):
            if c[i][j] == 1:
                cnt += 1
                dfs(c,w,h,j,i)
    ans.append(str(cnt))
for i in range(len(ans)):
    print(ans[i])

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():
    while len(stack) > 0:
        height, width = stack.pop()
        for k in range(-1, 2):
            for l in range(-1, 2):
                new_h, new_w = height + k, width + l
                if new_h < 0 or new_w < 0 or new_h >= h or new_w >= w:
                    continue
                #訪れていない場所で，そこが島だったら
                if visited[new_h][new_w] == 0 and c[new_h][new_w] == 1:
                    visited[new_h][new_w]  = 1
                    stack.append([new_h, new_w])

    return 1

#実行部分
while True:
    w, h = map(int, input().split())
    #入力が終わるとき
    if w == 0 and h == 0:
        break
    else:
        c = [list(map(int, input().split())) for _ in range(h)]
        visited = [[0] * w for _ in range(h)]
        ans = 0

        #実行部分
        for i in range(h):
            for j in range(w):
                if visited[i][j] == 0 and c[i][j] == 1:
                    visited[i][j] = 1
                    stack = [[i, j]]
                    ans += dfs()
        print(ans)

Python: import sys
sys.setrecursionlimit(10 ** 9)
while True:
    w, h = map(int, input().split())
    if w == 0 and h == 0:
        break
    c = [list(map(int, input().split())) for _ in range(h)]
    seen = [[False for _ in range(w)] for _ in range(h)]

    def dfs(x, y, seen):
        if not (0 <= x < h and 0 <= y < w):
            return
        if seen[x][y]:
            return
        if c[x][y] == 0:
            return
        seen[x][y] = True
        for dx in [-1, 0, 1]:
            for dy in [-1, 0, 1]:
                dfs(x + dx, y + dy, seen)

        return seen

    cnt = 0
    for i in range(h):
        for j in range(w):
            if c[i][j] == 1 and seen[i][j] == False:
                cnt += 1
                dfs(i, j, seen)

    print(cnt)