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 collections

while True:
    w, h = map(int, input().split())
    if not w and not h:
        break
    graph = [list(map(int, input().split())) for _ in range(h)]
    seen = [[False] * w for i in range(h)]

    dy = [0, 1, 0, -1, 1, 1, -1, -1]
    dx = [1, 0, -1, 0, 1, -1, 1, -1]

    def dfs(v):
        stack = collections.deque()
        stack.append(v)
        while stack:
            y, x = stack.pop()
            for i in range(8):
                ny = y + dy[i]
                nx = x + dx[i]
                if not (-1 < ny < h and -1 < nx < w):
                    continue
                if not graph[ny][nx]:
                    continue
                if seen[ny][nx]:
                    continue
                seen[ny][nx] = True
                stack.append([ny, nx])

    count = 0
    for i in range(h):
        for j in range(w):
            if graph[i][j] and not seen[i][j]:
                dfs([i, j])
                count += 1

    print(count)

Python: #!/usr/bin/env python3

import sys
import math
from bisect import bisect_right as br
from bisect import bisect_left as bl
sys.setrecursionlimit(2147483647)
from heapq import heappush, heappop,heappushpop
from collections import defaultdict
from itertools import accumulate
from collections import Counter
from collections import deque
from operator import itemgetter
from itertools import permutations
mod = 10**9 + 7
inf = float('inf')
def I(): return int(sys.stdin.readline())
def LI(): return list(map(int,sys.stdin.readline().split()))

while 1:
    w,h = LI()
    if w == 0 and h == 0:
        break
    c = [LI() for _ in range(h)]
    check = [[True]*w for _ in range(h)]

    dx,dy = [1,1,0,-1,-1,-1,0,1],[0,1,1,1,0,-1,-1,-1]
    ans = 0
    for i in range(h):
        for j in range(w):
            if c[i][j] and check[i][j]:
                que = deque()
                que.append((i,j))
                check[i][j] = False
                ans += 1
                while que:
                    y,x = que.popleft()
                    for k in range(8):
                        ny,nx = y+dy[k],x+dx[k]
                        if 0 <= ny < h and 0 <= nx < w:
                            if check[ny][nx]:
                                if c[ny][nx]:
                                    que.append((ny,nx))
                                    check[ny][nx] = False
    print(ans)

Python: def fill(y,x):
    global w,h,l
    if 0<=y<h and 0<=x+1<w and l[y][x+1]==1:
        l[y][x+1]=0
        fill(y,x+1)
    if 0<=y<h and 0<=x-1<w and l[y][x-1]==1:
        l[y][x-1]=0
        fill(y,x-1)
    if 0<=y+1<h and 0<=x<w and l[y+1][x]==1:
        l[y+1][x]=0
        fill(y+1,x)
    if 0<=y-1<h and 0<=x<w and l[y-1][x]==1:
        l[y-1][x]=0
        fill(y-1,x) 
    
while 1:
    w,h=map(int,input().split())
    if not w and not h:break
    l=[map(int,input().split()) for _ in range(h)]

    cnt=0
    while 1:
        cds=[[i,j.index(1)] for (i,j) in enumerate(l) if 1 in j]
        if not cds:
            break
        else:
            y,x=cds[0]
        l[y][x]=0
        fill(y,x)
        cnt+=1
    print(cnt)

Python: dy = (-1,-1,0,1,1,1,0,-1)
dx = (0,1,1,1,0,-1,-1,-1)

def main():
    while True:
        w,h = map(int,input().split())
        if h == 0:
            return
        grid = [list(map(int,input().split())) for _ in range(h)]
        visited = [[0] * w for _ in range(h)]
        ans = 0
        for i in range(h):
            for j in range(w):
                if grid[i][j] == 1 and visited[i][j] == 0:
                    ans += 1
                    stack = [(i,j)]
                    visited[i][j] = 1
                    while stack:
                        p,q = stack.pop()
                        for k in range(8):
                            y = p + dy[k]
                            x = q + dx[k]
                            if y < 0 or y >= h:
                                continue
                            if x < 0 or x >= w:
                                continue
                            if grid[y][x] == 1 and visited[y][x] == 0:
                                stack.append((y,x))
                                visited[y][x] = 1
        print(ans)
if __name__ == '__main__':
    main()