Go: package main

import (
	"bufio"
	"fmt"
	"os"
	"strconv"
)

func getScanner(fp *os.File) *bufio.Scanner {
	scanner := bufio.NewScanner(fp)
	scanner.Split(bufio.ScanWords)
	scanner.Buffer(make([]byte, 1000005), 1000005)
	return scanner
}

func getNextString(scanner *bufio.Scanner) string {
	scanner.Scan()
	return scanner.Text()
}

func getNextInt(scanner *bufio.Scanner) int {
	i, _ := strconv.Atoi(getNextString(scanner))
	return i
}

func getNextInt64(scanner *bufio.Scanner) int64 {
	i, _ := strconv.ParseInt(getNextString(scanner), 10, 64)
	return i
}

func getNextUint64(scanner *bufio.Scanner) uint64 {
	i, _ := strconv.ParseUint(getNextString(scanner), 10, 64)
	return i
}

func getNextFloat64(scanner *bufio.Scanner) float64 {
	i, _ := strconv.ParseFloat(getNextString(scanner), 64)
	return i
}

func main() {
	fp := os.Stdin
	wfp := os.Stdout
	cnt := 0

	if os.Getenv("MASPY") == "ますピ" {
		fp, _ = os.Open(os.Getenv("BEET_THE_HARMONY_OF_PERFECT"))
		cnt = 0
	}
	if os.Getenv("MASPYPY") == "ますピッピ" {
		wfp, _ = os.Create(os.Getenv("NGTKANA_IS_GENIUS10"))
	}

	scanner := getScanner(fp)
	writer := bufio.NewWriter(wfp)
	for solve(scanner, writer) {

	}
	for i := 0; i < cnt; i++ {
		fmt.Fprintln(writer, "-----------------------------------")
		solve(scanner, writer)
	}
	writer.Flush()
}

func solve(scanner *bufio.Scanner, writer *bufio.Writer) bool {
	sol := solver{}
	sol.w = getNextInt(scanner)
	sol.h = getNextInt(scanner)
	if sol.w == 0 && sol.h == 0 {
		return false
	}
	sol.land = makeInts(sol.h, sol.w)
	for y := 0; y < sol.h; y++ {
		for x := 0; x < sol.w; x++ {
			sol.land[y][x] = getNextInt(scanner)
		}
	}
	ans := 0
	for y := 0; y < sol.h; y++ {
		for x := 0; x < sol.w; x++ {
			if sol.land[y][x] == 0 {
				continue
			}
			ans++
			sol.dfs(y, x)
		}
	}
	fmt.Fprintln(writer, ans)
	return true
}

type solver struct {
	w, h int
	land [][]int
}

func (sol *solver) dfs(y, x int) {
	if y < 0 {
		return
	}
	if y >= sol.h {
		return
	}
	if x < 0 {
		return
	}
	if x >= sol.w {
		return
	}
	if sol.land[y][x] == 0 {
		return
	}
	sol.land[y][x] = 0
	dy := [8]int{-1, -1, -1, 0, 0, 1, 1, 1}
	dx := [8]int{-1, 0, 1, -1, 1, -1, 0, 1}
	for i := 0; i < 8; i++ {
		sol.dfs(y+dy[i], x+dx[i])
	}
}
func makeInts(h, w int) [][]int {
	index := make([][]int, h, h)
	data := make([]int, h*w, h*w)
	for i := 0; i < h; i++ {
		index[i] = data[i*w : (i+1)*w]
	}
	return index
}

Python: import sys
sys.setrecursionlimit(500000)

def allblue(H, W, C):
    for h in range(H):
        for w in range(W):
            if C[h][w] == 1:
                return (h, w)
    return (-1, -1)

directions = [(0, 1), (0, -1), (1, 1), (1, 0), (1, -1), (-1, -1), (-1, 0), (-1, 1)]
def dfs(h, w, C):
    C[h][w] = 0
    for dh, dw in directions:
        if 0 <= h+dh < H and 0 <= w+dw < W and C[h+dh][w+dw] == 1:
            dfs(h+dh, w+dw, C)

while True:
    W, H = map(int, input().split())
    if W == 0 and H == 0:
        exit()
    C = [list(map(int, input().split())) for i in range(H)]

    ans = 0
    while True:
        h, w = allblue(H, W, C)
        if (h, w) == (-1, -1):
            break
        dfs(h, w, C)
        ans += 1

    print(ans)

Python: import sys
sys.setrecursionlimit(10000)
def search(x,y,m):
    if not(0<=x<len(m[0]) and 0<=y<len(m)) or m[y][x]=='0': return
    m[y][x] = '0'
    for dx,dy in [[-1,-1],[0,-1],[1,-1],[-1,0],[1,0],[-1,1],[0,1],[1,1]]:
        search(x+dx,y+dy,m)
while True:
    w,h = map(int,input().split())
    if w==h==0: break
    m = [input().split() for _ in range(h)]
    c = 0
    for y in range(h):
        for x in range(w):
            if m[y][x]=='1':
                c += 1
                search(x,y,m)
    print(c)

Python: 
if __name__ == "__main__":
    while True:
        w, h = map(int, input().split())
        if w == 0 and h == 0:
            break
        c = []
        for _ in range(h):
            hi = list(map(int, input().split()))
            c.append(hi)
        
        visited = []
        for _ in range(h):
            hi = [False] * w
            visited.append(hi)
        
        st = []
        ans = 0

        for s_row in range(h):
            for s_col in range(w):
                if c[s_row][s_col] != 0 and not visited[s_row][s_col]:
                    st = [(s_row, s_col)]
                    while st:
                        now = st.pop()
                        for i in range(-1, 2):
                            for j in range(-1, 2):
                                if now[0] + i >= 0 and now[0] + i < h and now[1] + j >= 0 and now[1] + j < w and not visited[now[0] + i][now[1] + j] and c[now[0] + i][now[1] + j] != 0:
                                    visited[now[0] + i][now[1] + j] = True
                                    st.append((now[0] + i, now[1] + j))
                    ans += 1
        print(ans)

Python: import sys
sys.setrecursionlimit(1000000)

while(1):
    w, h = map(int, input().split())
    if w == 0 and h == 0:
        break
    else:
        maps = [[-1]*(w+2)] + [([-1] + list(map(int, input().split())) + [-1]) for _ in range(h)] + [[-1]*(w+2)]
        seen = [[True]*(w+2)] + [([True] + [False]*w + [True]) for _ in range(h)] + [[True]*(w+2)]
        dxy = ((-1, -1), (-1, 0), (-1, 1), (0, -1), (0, 1), (1, -1), (1, 0), (1, 1))
        
        
        def dfs(y, x):
            seen[y][x] = True
            for i in dxy:
                if seen[y+i[0]][x+i[1]] is False:
                    if maps[y+i[0]][x+i[1]] == 0:
                        seen[y+i[0]][x+i[1]] = True
                    else:
                        dfs(y+i[0], x+i[1])
        
        now = 0
        ans = 0
        while now < w * h:
            y = now // w + 1
            x = now % w + 1
            if seen[y][x] is False:
                if maps[y][x] == 0:
                    seen[y][x] = True
                else:
                    ans += 1
                    dfs(y, x)
            
            now += 1
        
        print(ans)

Python: import sys
sys.setrecursionlimit(10**8)

ans = []

def dfs(x, y):
    c[x][y] = 0

    for dx in range(-1, 2):
        for dy in range(-1, 2):
            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

    count = 0

    c = [[] for _ in range(h)]
    for i in range(h):
        if w == 1:
            c[i] = [int(input())]
        else:
            c[i] = list(map(int, input().split()))

    for x in range(h):
        for y in range(w):
            if c[x][y] == 1:
                dfs(x, y)
                count += 1

    ans.append(count)

for i in ans:
    print(i)

Python: import sys
sys.setrecursionlimit(5000)

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

def dfs(area, x, y):
    area[x][y] = 0
    for i in dx:
        for j in dy:
            next_x = x + i
            next_y = y + j
            if area[next_x][next_y] == 1:
                dfs(area, next_x, next_y)

def solver(w, h):
    ans = 0
    area = [[0]*(w+2)]
    for i in range(h):
        area.append([0]+list(map(int, input().split()))+[0])
    area.append([0]*(w+2))

    for i in range(1, h+1):
        for j in range(1, w+1):
            if area[i][j] == 1:
                ans += 1
                dfs(area, i, j)
    return ans

while True:
    w, h = map(int, input().split())
    if w == h == 0:
        break
    print(solver(w, h))