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
sys.setrecursionlimit(10**7)
vec = [(1,0),(0,1),(-1,0),(0,-1),(1,1),(-1,-1),(1,-1),(-1,1)]
def dfs(x,y,visited,field):
        
     
        visited[x][y] = 1
        for nx,ny in vec:
            tx = x + nx
            ty = y+ny
            if tx < 0 or ty < 0 or tx > h-1 or ty > w-1:continue
            if visited[tx][ty]:continue
            if field[tx][ty] == 0:continue
            dfs(tx,ty,visited,field)
            
        return
while True:    
    w,h = map(int,input().split())
    if w == 0 and h == 0:break
    field = [list(map(int,input().split()))for i in range(h)]
    visited = [[0]*w for i in range(h)]
    ans = 0
    
    for i in range(h):
        for j in range(w):
            if field[i][j] == 1 and visited[i][j] == 0:
                dfs(i,j,visited,field)
                ans +=1
    
    print(ans)

Python: import sys
sys.setrecursionlimit(10**7)



def tansaku(i,j):
	for di in range(-1,2):
		for dj in range(-1,2):
			if 0<=i+di<h and 0<=j+dj<w:
					if visited[i+di][j+dj]:
						continue
					else:
						visited[i][j]=1
						if c[i][j]==0:continue
						tansaku(i+di,j+dj)
			else:continue
			
			
	return

			
def dfs(i,j):
	global count
	if visited[i][j]:return
	visited[i][j]=1
	# print(visited)
	if c[i][j]==0:return
	count+=1
	tansaku(i,j)

while True:
	# print('スタート')
	w,h =list(map(int,input().split()))
	if w==0 and h==0:break
	c=[list(map(int,input().split())) for i in range(h)]
	visited=[[0]*w for i in range(h)]
	count=0
	for s in range(w):
		for t in range(h):
			dfs(t,s)

	print(count)

Python: #!/usr/bin/env python
# -*- coding: utf-8 -*-

def dfs(s,Map,H,W,c):
    dxdy = [(1,0),(-1,0),(0,1),(0,-1),(1,1),(-1,-1),(-1,1),(1,-1)]
    for i in range(2):
        Map[s[0]][s[1]] = c
        nextPos = (s[0]+dxdy[i][0],s[1]+dxdy[i][1])
        if nextPos[0] >= 0 and nextPos[1] >= 0 and nextPos[0] < H and nextPos[1] < W:
            if Map[nextPos[0]][nextPos[1]] == 1:
                dfs(nextPos,Map,H,W,c)

while True:
    W,H = map(int,input().split(" "))
    if W == 0 and H == 0:
        break
    Map = [list(map(int,input().split())) for i in range(0,H)]
    c = 1
    for i in range(H):
        for j in range(W):
            if Map[i][j] == 1:
                c += 1
                dfs((i,j),Map,H,W,c)
    print(c-1)

Python: import sys
sys.setrecursionlimit(100000)


def dfs(x,graph,seen,nxt):
    seen[x]=1
    if x in nxt:
        nxt.remove(x)
    nxt+=[y for y in graph[x] if not seen[y] and y not in nxt]
    while nxt :
        dfs(nxt.pop(-1),graph,seen,nxt)


def island_count(w,h):
    lst=[list(map(int,input().split())) for _ in range(h)]
    graph={}
    for i in range(h):
        for j in range(w):
            if not lst[i][j] : continue
            graph[(i,j)]=[]
            for k in range(-1,2):
                for l in range(-1,2):
                    if k==0 and l==0 : continue
                    if i+k<0 or j+l<0 : continue
                    try:
                        if lst[i+k][j+l]:
                            graph[(i,j)].append((i+k,j+l))
                    except IndexError:
                        continue
    #print(graph)
    seen={x:0 for x in graph}
    sm=0
    nxt=[]
    for x in seen:
        if seen[x] : continue
        if not seen[x]:
            dfs(x,graph,seen,nxt)
            sm+=1

    print(sm)






while 1 :
    w,h=map(int,input().split())
    if (w,h)==(0,0) : break
    island_count(w,h)

Python: import math,string,itertools,fractions,heapq,collections,re,array,bisect,sys,random,time,copy,functools

sys.setrecursionlimit(10**7)
inf = 10**20
eps = 1.0 / 10**10
mod = 10**9+7

def LI(): return [int(x) for x in sys.stdin.readline().split()]
def LI_(): return [int(x)-1 for x in sys.stdin.readline().split()]
def LF(): return [float(x) for x in sys.stdin.readline().split()]
def LS(): return sys.stdin.readline().split()
def I(): return int(sys.stdin.readline())
def F(): return float(sys.stdin.readline())
def S(): return input()
def pf(s): return print(s, flush=True)


def main():
    rr = []

    dd = [(-1,0),(1,0),(0,-1),(0,1),(-1,-1),(-1,1),(1,-1),(1,1)]

    while True:
        w,h = LI()
        if w == 0:
            break
        a = [LI() for _ in range(h)]
        f = collections.defaultdict(bool)
        r = 0
        for i in range(h):
            for j in range(w):
                if f[(i,j)] or a[i][j] == 0:
                    continue
                r += 1
                q = [(i,j)]
                f[(i,j)] = True
                qi = 0
                while len(q) > qi:
                    ci,cj = q[qi]
                    qi += 1
                    for di,dj in dd:
                        ni = ci + di
                        nj = cj + dj
                        if 0 <= ni < h and 0 <= nj < w and a[ni][nj] == 1 and not f[(ni,nj)]:
                            f[(ni,nj)] = True
                            q.append((ni,nj))
        rr.append(r)

    return '\n'.join(map(str, rr))


print(main())