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: # -*- coding: utf-8 -*-
def dfs(x,y):
    c[x][y] = 0
    for dx in [-1,0,1]:
        for dy in [-1,0,1]:
            nx = x + dx
            ny = y + dy
            if 0 <= nx < h and 0 <= ny < w and c[nx][ny] == 1:
                dfs(nx, ny)
 
while True:
    w, h = map(int,input().split())
    if w == 0 and h == 0 :
        break
 
    c = [list(map(int,input().split())) for j in range(h)]
    count = 0
 
    for i in range(h):
        for j in range(w):
            if c[i][j] == 1:
                dfs(i,j)
                count += 1
 
    print(count)

Python: # 25

import sys
import itertools

sys.setrecursionlimit(10**7) #再帰関数の呼び出し制限
while True:
    w, h = map(int, input().split())
    if w == 0 and h == 0:
        break
    c_l = [[int(x) for x in input().split()] for y in range(h)]
    s_l = [[True] * w for x in range(h)]
    v_l = list(itertools.product([-1,0,1],repeat=2))
    
    def dfs(y, x):
        if x < 0 or y < 0 or x >=w or y >= h:
            return False
        if not s_l[y][x]:
            return False
        s_l[y][x] = False
        _c = c_l[y][x]
        if _c == 0:
            return False
        for _v in v_l:
            dfs(y+_v[0],x+_v[1])
        return True

    ans = 0
    for i in range(h):
        for j in range(w):
            if s_l[i][j]:
                if dfs(i, j):
                    ans += 1
                    
    print(ans)

Python: def f(x,y):
    a[y][x]='0'
    for dx,dy in[[-1,0],[1,0],[0,-1],[0,1],[-1,-1],[1,-1],[-1,1],[1,1]]:
        dx+=x;dy+=y
        if 0<=dx<w and 0<=dy<h and a[dy][dx]=='1':f(dx,dy)
while 1:
    w,h=map(int,input().split())
    if w==0:break
    a=[list(input().split()) for _ in[0]*h];b=0
    for i in range(w):
        for j in range(h):
            if a[j][i]=='1':
                b+=1;f(i,j)
    print(b)

Python: import queue

def proceess(start_x,start_y):
    #print("start_x : " + str(start_x) + ", start_y : " + str(start_y))
    #insland = []
    #insland.append([start_x,start_y])
    new_island = queue.Queue()
    map[start_x][start_y] = 0
    new_island.put([start_x,start_y])
    while True:
        ob = new_island.get()
        x = ob[0]
        y = ob[1]
        #print("x : " + str(x) + ", y : " + str(y))

        for i in [-1,0,1]:
            for j in [-1,0,1]:
                nx = x + i
                ny = y + j

                if nx >= 0 and ny >= 0 and nx < h and ny < w:
                    if map[nx][ny] == 1:
                        #insland.append([nx,ny])
                        #print("ny : " + str(ny) + ", nx : " + str(nx))
                        new_island.put([nx,ny])
                        map[nx][ny] = 0

        #print("end 8 count.")
        if new_island.empty():
            break

while True:
    map = []

    tmp = input().split(" ")
    w = int(tmp[0])
    h = int(tmp[1])

    if w == 0 and h == 0:
        break


    for j in range(h):
        nova = []
        arm = input()
        for k in arm.split(" "):
            #k.rstrip('\n')
            nova.append(int(k))
        map.append(nova)

    #print(map)

    count = 0
    for i in range(h):
        for j in range(w):
            if map[i][j] == 1:
                #print("i : " + str(i) + ", j : " + str(j))
                proceess(i,j)
                count += 1

    print(count)

Python: # -*- coding: utf-8 -*-
import sys
INF=10**18
MOD=10**9+7
def input(): return sys.stdin.readline().rstrip()


def main():
    while True:
        W,H=map(int,input().split())
        if W==H==0:
            exit()
        C=[[] for _ in range(H+2)]
        C[0]=C[H+1]=[-1]*(W+2)
        used=[[False]*(W+2) for _ in range(H+2)]
        rands=[]
        for column in range(1,H+1):
            C[column]=[-1]+list(map(int,input().split()))+[-1]
            for row,x in enumerate(C[column]):
                if x==1:
                    rands.append((column,row))

        ans=0
        
        if rands:
            s=[]
            while rands:
                y,x=rands.pop()
                if used[y][x]:
                    continue
                s.append((y,x))
                while s:
                    y,x=s.pop()
                    if used[y][x]:
                        continue
                    used[y][x]=True
                    for dy in range(-1,2):
                        for dx in range(-1,2):
                            ny,nx=y+dy,x+dx
                            if dy==dx==0 or used[ny][nx]:
                                continue
                            if C[ny][nx]==1:
                                s.append((ny,nx))
                ans+=1
        print(ans)
                

if __name__ == '__main__':
    main()