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 ** 9)

def search_island(h, w, max_h, max_w):
    for i in range(8):
        next_h = h + [1, 1, 0, -1, -1, -1, 0, 1][i]
        next_w = w + [0, 1, 1, 1, 0, -1, -1, -1][i]
        if not 0 <= next_h < max_h or not 0 <= next_w < max_w:
            continue
        elif step[next_h][next_w] or not field[next_h][next_w]:
            continue
        step[next_h][next_w] = True
        search_island(next_h, next_w, max_h, max_w)

while True:
    max_w, max_h = map(int, input().split())
    if max_w == max_h == 0:
        break
    field = [[int(i) for i in input().split()] for _ in range(max_h)]
    step = [[False for _ in range(max_w)] for _ in range(max_h)]
    island = 0
    for i in range(max_h):
        for j in range(max_w):
            if step[i][j] or not field[i][j]:
                continue
            search_island(i, j, max_h, max_w)
            island += 1
    print(island)

Python: import sys

sys.setrecursionlimit(1000000)


def rec(y, x, f):
    f[y][x] = '0'
    for dy, dx in [(-1, -1), (-1, 0), (-1, 1), (0, -1), (0, 1), (1, -1), (1, 0),
            (1, 1)]:
        if 0 <= y+dy < len(f) and 0 <= x+dx < len(f[0]) and f[y+dy][x+dx] == '1':
            rec(y+dy, x+dx, f)


def main():
    while True:
        w, h = [int(i) for i in input().split()]
        if w == 0 and h == 0:
            break
        field = []
        for i in range(h):
            field.append(input().split())
        ans = 0
        for i in range(h):
            for j in range(w):
                if field[i][j] == '1':
                    rec(i, j, field)
                    ans += 1
        print(ans)


if __name__ == '__main__':
    main()

Python: import sys
sys.setrecursionlimit(4100000)


def dfs(cy, cx):
    # 一回走らせたら一つの島が消滅すると考える
    if not (cy < 0 or cy >= H or cx < 0 or cx >= W or gridgraph[cy][cx] == "0"):
        gridgraph[cy][cx] = "0"
        for dy, dx in adjacent:
            ny, nx = cy+dy, cx+dx
            dfs(ny, nx)


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

Python: while 1:
	W, H = map(int, input().split())
	field = [input().split() for i in range(H)]
	if W == 0 and H == 0:
		break
	
	searched = [[0]*W for i in range(H)]
	stack = []
	count = 0
	for y in range(H):
		for x in range(W):
			if searched[y][x] == 0:
				searched[y][x] = 1
				if field[y][x] == '1':
					stack += [[x, y]]
					count += 1
					while (stack):
						sx, sy = stack.pop()
						for m in range(8):
							ny = sy + [0,1,1,1,0,-1,-1,-1][m]
							nx = sx + [1,1,0,-1,-1,-1,0,1][m]
							if (ny >= 0 and ny < H) and (nx >= 0 and nx < W):
								if (searched[ny][nx] == 0) and (field[ny][nx] == '1'):
									searched[ny][nx] = 1
									stack += [[nx, ny]]
	else:
		print(count)

Python: def dfs(w,h,W,H,ID,islands,islandsID):
    if islands[h][w]==1 and islandsID[h][w]!=0:
        for i in range(-1,2):
            for j in range(-1,2):
                dw=w+i
                dh=h+j
                if dw>=0 and dw<W and dh>=0 and dh<H:
                    if islands[dh][dw]==1:
                        islandsID[dh][dw]=islandsID[h][w]
    if islands[h][w]==1 and islandsID[h][w]==0:
        for i in range(-1,2):
            for j in range(-1,2):
                dw=w+i
                dh=h+j
                if dw>=0 and dw<W and dh>=0 and dh<H:
                    if islands[dh][dw]==1:
                        islandsID[dh][dw]=ID
        ID+=1
    return ID

while True:
    islands=[]
    islandsID=[]
    ID=1
    W,H=map(int,input().split())
    if W==0:
        break
    for i in range(H):
        islandsID.append([0 for j in range(W)])
    for _ in range(H):
        islands.append(list(map(int,input().split())))
    for h in range(H):
        for w in range(W):
            ID=dfs(w,h,W,H,ID,islands,islandsID)
    print(ID-1)