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: from collections import deque
while True:
    w,h=map(int,input().split())
    if w==0 and h==0:
        exit()
    field=[input().split() for i in range(h)]
    
    option=deque()
    for i in range(h):
        for j in range(w):
            if field[i][j]=="1":
                option.append([i,j])
                break
        else:
            continue
        break
    completed=[[0]*w for i in range(h)]
    cnt=1
    while option:
        y,x=option.pop()
        completed[y][x]=cnt
        for dy,dx in ((-1,0),(1,0),(0,-1),(0,1),(-1,-1),(1,-1),(-1,1),(1,1)):
            if 0<=y+dy<=h-1 and 0<=x+dx<=w-1 and field[y+dy][x+dx]=="1" and completed[y+dy][x+dx]==0:
                ny=y+dy
                nx=x+dx
                option.append([ny,nx])
        if len(option)==0:
            for i in range(h):
                for j in range(w):
                    if field[i][j]=="1" and completed[i][j]==0:
                        option.append([i,j])
                        cnt+=1
                        break
                else:
                    continue
                break
    ans=0
    for i in completed:
        tmp=max(i)
        ans=max(ans,tmp)
    print(ans)

Python: import sys
sys.setrecursionlimit(2500)
def dfs(i, j):
    global visited
    visited[i][j] = True
    for ii in [i - 1, i, i + 1]:
        for jj in [j - 1, j, j + 1]:
            if c[ii][jj] and not visited[ii][jj]:
                dfs(ii, jj)

w_list = []
h_list = []
c_list = []
while True:
    w, h = [int(x) for x in input().split()]
    if w == h == 0: break
    # dfsの条件分岐を減らすために、周りを海で囲む
    c = [[0 for _ in range(w + 2)]] + \
        [[0] + [int(x) for x in input().split()] + [0] for _ in range(h)] + \
        [[0 for _ in range(w + 2)]]
    w_list.append(w)
    h_list.append(h)
    c_list.append(c)

for w, h, c in zip(w_list, h_list, c_list):
    visited = [[False for _ in range(w + 2)] for _ in range(h + 2)]
    ans = 0
    for i in range(1, h + 1):
        for j in range(1, w + 1):
            if c[i][j] == 1 and not visited[i][j]:
                ans += 1
                dfs(i, j)
    print(ans)

Python: from itertools import product
import sys

sys.setrecursionlimit(10 ** 6)

def solve(H, W, C):
    def dfs(h, w):
        if h < 0 or h >= H or w < 0 or w >= W:
            return 0
        elif C[h][w] == 0:
            return 0
        else:
            C[h][w] = 0
            for dh, dw in product((1, 0, -1), repeat = 2):
                dfs(h+dh, w+dw)
            return 1
    
    cnt = 0

    for h in range(H):
        for w in range(W):
            cnt += dfs(h, w)

    print(cnt)

A = []
while True:
    W, H = [int(i) for i in input().split()]
    if W == 0 and H == 0:
        break
    else:
        C = [[int(i) for i in input().split()] for j in range(H)]
        A.append((H, W, C))

for a in A:
    solve(*a)

Python: import sys
sys.setrecursionlimit(10 ** 7)
def dfs(h, w, grid):
    grid[h][w] = 0

    # 八方向を探索
    for dh in range(-1, 2):
        for dw in range(-1, 2):
            nh = dh + h
            nw = dw + w

            # 場外だった場合はするー(番兵)
            if nh < 0 or nw < 0:
                continue
            if grid[nh][nw] == 0:
                continue
            # 次に進む
            dfs(nh, nw, grid)
while True:
    grid = []
    W, H = map(int, input().split())
    if W == 0 and H == 0:
        break
    grid.append([0] * (W+2))
    grid += [[0] + list(map(int, input().split())) + [0] for _ in range(H)]
    grid.append([0] * (W+2))

    cnt = 0
    for h in range(1, H+1):
        for w in range(1, W+1):
            if grid[h][w] == 0:
                continue
            dfs(h, w, grid)
            cnt += 1
    print(cnt)

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)